A262087 Largest palindrome p such that n-p is again a palindrome, or 0 if no such p exists.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 0, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 0, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 0, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 0, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 0, 66, 66, 66, 66, 66, 66, 66, 66, 66, 66, 0, 77, 77, 77, 77, 77, 77

Offset: 0

Author

M. F. Hasler, Sep 10 2015

Keywords

• nonn
• base

Links

• Markus Sigg, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A261423, A002113, A035137.

Programs

PARI

a(N,P=A261423(N))=until(N<2*P=A261423(P-1),is_A002113(N-P)&&return(P))

Formula

a(n) = 0 for n in {0} union A035137.