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

1,1

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.

Links

Table of n, a(n) for n=1..59.

Formula

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

Example

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

Mathematica

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

Prog

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

Crossrefs

Equals A000040 \ A002385.

Intersection of A029742 and A000040.

Sequence in context: A045921 A296520 A334391 * A034845 A241059 A040136

Adjacent sequences: A334318 A334319 A334320 * A334322 A334323 A334324

Keyword

nonn,base

Author

Bernard Schott, Apr 23 2020

Status

approved