number.wiki

Term

Palindromic Prime

Primes that are also decimal palindromes (2, 3, 5, 7, 11, 101, 131, 151, 181, 191, 313, …).

113 numbers tagged.

A palindromic prime is prime and reads the same forwards and backwards: 2, 3, 5, 7, 11, 101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757.

Apart from 11, every palindromic prime has an odd number of digits — because any even-length palindrome is divisible by 11. The largest known palindromic primes have hundreds of thousands of digits. A delightful relative is 1000000000000066600000000000001, the Belphegor's prime, a palindrome with 666 nestled in the middle and 13 zeros on each side.

2 3 5 7 11 101 131 151 181 191 313 353 373 383 727 757 787 797 919 929 10,301 10,501 10,601 11,311 11,411 12,421 12,721 12,821 13,331 13,831 13,931 14,341 14,741 15,451 15,551 16,061 16,361 16,561 16,661 17,471 17,971 18,181 18,481 19,391 19,891 19,991 30,103 30,203 30,403 30,703 30,803 31,013 31,513 32,323 32,423 33,533 34,543 34,843 35,053 35,153 35,353 35,753 36,263 36,563 37,273 37,573 38,083 38,183 38,783 39,293 70,207 70,507 70,607 71,317 71,917 72,227 72,727 73,037 73,237 73,637 74,047 74,747 75,557 76,367 76,667 77,377 77,477 77,977 78,487 78,787 78,887 79,397 79,697 79,997 90,709 91,019 93,139 93,239 93,739 94,049 94,349 94,649 94,849 94,949 95,959 96,269 96,469 96,769 97,379 97,579 97,879 98,389 98,689