A222727 Palindromic primes starting with a digit 7.

7, 727, 757, 787, 797, 70207, 70507, 70607, 71317, 71917, 72227, 72727, 73037, 73237, 73637, 74047, 74747, 75557, 76367, 76667, 77377, 77477, 77977, 78487, 78787, 78887, 79397, 79697, 79997, 7014107, 7035307, 7036307, 7041407, 7046407, 7057507, 7065607, 7069607

Offset: 1

Author

Jaroslav Krizek, Mar 09 2013

Keywords

• nonn
• base

Comments

Subsequence of A002385 (palindromic primes) and A002113 (palindromic numbers). Complement of A222728 (palindromic composite numbers starting with a digit 7) with respect to A043042 (palindromic numbers starting with a digit 7).

Links

• Jaroslav Krizek, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A002385, A002113, A222728, A043042.

Programs

Mathematica

Select[Prime[Range[500000]],PalindromeQ[#]&&Mod[#,10]==7&] (* Harvey P. Dale, Nov 22 2022 *)