A222724 Palindromic nonprime numbers starting with a digit 1.

1, 111, 121, 141, 161, 171, 1001, 1111, 1221, 1331, 1441, 1551, 1661, 1771, 1881, 1991, 10001, 10101, 10201, 10401, 10701, 10801, 10901, 11011, 11111, 11211, 11511, 11611, 11711, 11811, 11911, 12021, 12121, 12221, 12321, 12521, 12621, 12921, 13031, 13131, 13231

Offset: 1

Author

Jaroslav Krizek, Mar 03 2013

Keywords

• nonn
• base

Comments

Subsequence of A032350 (palindromic nonprime numbers) and A002113 (palindromic numbers). Complement of A222723 (palindromic primes starting with a digit 1) with respect to A043036 (palindromic numbers starting with a digit 1).

Links

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

Crossrefs

Cf. A032350, A002113, A222723, A043036.