Numbers up to 50000000 Prime numbers 3001134 Number of strictly non-palindromic primes 169194 Number of strictly non-palindromic twin primes 805 Biggest gap between strictly non-palindromic prime numbers 238 primes. Gap starts with 22316153 (palindromic prime numbers > base + 1) 1-time palindromic; total number 471654 5 first 1-time palindromic; base 2 2-times palindromic; total number 667031 17 first 2-times palindromic; bases 2 4 3-times palindromic; total number 638189 191 first 3-times palindromic; bases 6 9 10 4-times palindromic; total number 468444 257 first 4-times palindromic; bases 2 4 7 16 5-times palindromic; total number 285192 1009 first 5-times palindromic; bases 11 15 19 24 28 6-times palindromic; total number 151648 4561 first 6-times palindromic; bases 4 31 47 48 57 60 7-times palindromic; total number 74168 4591 first 7-times palindromic; bases 19 20 24 33 37 51 54 8-times palindromic; total number 35456 21601 first 8-times palindromic; bases 12 29 33 69 108 120 135 144 9-times palindromic; total number 17525 57601 first 9-times palindromic; bases 39 47 51 87 180 192 200 225 240 10-times palindromic; total number 9142 54121 first 10-times palindromic; bases 46 47 50 61 70 76 87 165 205 220 11-times palindromic; total number 4997 86677 first 11-times palindromic; bases 2 48 58 64 66 70 94 107 113 151 233 12-times palindromic; total number 3002 176401 first 12-times palindromic; bases 59 69 73 136 300 315 336 350 360 392 400 420 13-times palindromic; total number 1909 415801 first 13-times palindromic; bases 82 159 208 462 495 504 525 540 550 594 600 616 630 14-times palindromic; total number 1177 291721 first 14-times palindromic; bases 122 146 148 172 205 233 311 390 408 429 440 442 510 520 15-times palindromic; total number 778 950041 first 15-times palindromic; bases 138 152 192 219 239 696 728 754 780 812 819 840 870 910 936 16-times palindromic; total number 528 1259701 first 16-times palindromic; bases 126 147 184 185 199 279 299 423 850 884 950 969 975 988 1020 1105 17-times palindromic; total number 373 3049201 first 17-times palindromic; bases 164 266 348 505 619 757 1260 1320 1386 1400 1452 1540 1575 1584 1650 1680 1694 18-times palindromic; total number 252 1670761 first 18-times palindromic; bases 10 121 161 348 591 918 936 945 952 1020 1071 1080 1092 1105 1170 1190 1224 1260 19-times palindromic; total number 163 6098401 first 19-times palindromic; bases 219 558 833 1009 1760 1800 1815 1848 1925 1936 1980 2016 2100 2178 2200 2310 2400 2420 2464 20-times palindromic; total number 102 3880801 first 20-times palindromic; bases 40 369 388 472 1400 1440 1470 1540 1568 1575 1584 1617 1650 1680 1760 1764 1800 1848 1925 1960 21-times palindromic; total number 87 5654881 first 21-times palindromic; bases 249 387 977 1683 1760 1785 1836 1848 1870 1890 1904 1980 2016 2040 2079 2142 2160 2244 2295 2310 2376 22-times palindromic; total number 43 13759201 first 22-times palindromic; bases 292 528 1253 2646 2700 2730 2800 2808 2912 2925 2940 3024 3120 3150 3185 3276 3360 3510 3528 3600 3640 3675 23-times palindromic; total number 23 18618601 first 23-times palindromic; bases 374 438 765 774 940 2969 3080 3100 3224 3255 3300 3410 3432 3575 3640 3720 3850 3900 4004 4030 4092 4200 4290 24-times palindromic; total number 20 14414401 first 24-times palindromic; bases 262 2730 2772 2800 2860 2880 2912 2925 3003 3080 3120 3150 3168 3276 3300 3360 3432 3465 3520 3575 3600 3640 3696 3744 25-times palindromic; total number 13 18960481 first 25-times palindromic; bases 57 313 680 1396 3080 3135 3168 3192 3240 3344 3360 3420 3465 3564 3591 3696 3762 3780 3960 3990 4104 4158 4180 4256 4320 26-times palindromic; total number 9 15135121 first 26-times palindromic; bases 292 473 533 611 1565 2772 2808 2860 2940 2970 3003 3024 3080 3120 3185 3234 3276 3432 3465 3510 3528 3640 3696 3780 3822 3861 27-times palindromic; total number 9 31600801 first 27-times palindromic; bases 3203 3990 4104 4158 4180 4200 4256 4275 4320 4389 4400 4560 4620 4725 4752 4788 4950 5016 5040 5130 5225 5280 5320 5400 5472 5544 5600 28-times palindromic; total number 1 45405361 first 28-times palindromic; bases 764 2514 4851 4914 5005 5040 5096 5148 5265 5292 5390 5460 5544 5616 5670 5720 5733 5880 5940 6006 6160 6237 6370 6435 6468 6480 6552 6615 29-times palindromic; total number 2 35814241 first 29-times palindromic; bases 358 1023 1099 2993 4256 4284 4389 4488 4522 4560 4620 4760 4788 4845 4896 5016 5040 5168 5236 5280 5320 5355 5472 5544 5610 5712 5814 5852 5984 30-times palindromic; total number 1 49729681 first 30-times palindromic; bases 962 1398 3011 5005 5040 5060 5148 5313 5382 5460 5520 5544 5616 5720 5796 5940 5980 6006 6072 6160 6210 6279 6435 6440 6552 6578 6831 6864 6930 7020 31-times palindromic; total number 1 43243201 first 31-times palindromic; bases 658 4680 4725 4752 4800 4914 4928 4950 5005 5040 5148 5200 5280 5400 5460 5544 5600 5616 5720 5775 5824 5850 5940 6006 6048 6160 6240 6300 6336 6435 6552 32-times palindromic; total number 1 41081041 first 32-times palindromic; bases 427 559 946 1000 4560 4620 4680 4752 4788 4914 4940 5005 5016 5040 5130 5148 5187 5320 5434 5460 5544 5616 5643 5720 5852 5928 5940 5985 6006 6160 6270 6384 Result sequence: Smallest prime p that is a palindrome in n different bases < p-1. 5 , 17 , 191 , 257 , 1009 , 4561 , 4591 , 21601 , 57601 , 54121 , 86677 , 176401 , 415801 , 291721 , 950041 , 1259701 , 3049201 , 1670761 , 6098401 , 3880801 , 5654881 , 13759201 , 18618601 , 14414401 , 18960481 , 15135121 , 31600801 , 45405361 , 35814241 , 49729681 , 43243201 , 41081041