A222727 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

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

MATHEMATICA

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

CROSSREFS

Cf. A002385, A002113, A222728, A043042.

Sequence in context: A068004 A098110 A062334 * A201485 A083978 A162138

Adjacent sequences: A222724 A222725 A222726 * A222728 A222729 A222730

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Mar 09 2013

STATUS

approved