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A117781
Total number of palindromic primes in base 6 below 6^n.
5
3, 4, 10, 10, 31, 31, 126, 126, 571, 571, 2752, 2752, 14248, 14248, 73971, 73971, 389920, 389920, 2108414, 2108414, 11512078, 11512078
OFFSET
1,1
COMMENTS
Every palindrome with an even number of digits is divisible by 11 (in base 6) and therefore is composite (not prime). Hence there is only one palindromic prime with an even number of digits.
LINKS
Eric Weisstein's World of Mathematics, Palindromic Prime.
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Martin Renner, Apr 15 2006
EXTENSIONS
a(11)-a(22) from the data at A117782 added by Amiram Eldar, Mar 21 2021
STATUS
approved