A334321 Non-palindromic primes.

13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 103, 107, 109, 113, 127, 137, 139, 149, 157, 163, 167, 173, 179, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 317, 331, 337, 347, 349

Offset: 1

Author

Bernard Schott, Apr 23 2020

Keywords

• nonn
• base

Comments

Not the same as A052085, primes whose decimal digits are grouped together: 2, 3, 5, 7, 11 are not terms of this sequence, then the next difference occurs for prime 1013 that belongs to this sequence but not to A052085.

Examples

			97 is prime and is not a palindrome, hence 97 belongs to this sequence.
		

Crossrefs

Equals A000040 \ A002385.

Intersection of A029742 and A000040.

Programs

Mathematica

Select[Range[350], PrimeQ[#] && !PalindromeQ[#] &] (* Amiram Eldar, Apr 23 2020 *)

PARI

isok(p) = if (isprime(p), my(d=digits(p)); d != Vecrev(d)); \\ Michel Marcus, Apr 23 2020

Formula

Formula : A087999(a(n)) = 1.