A180611 Largest palindromic prime divisor of semiprime(n). Zero if no such divisor exists.

2, 3, 3, 5, 7, 5, 7, 11, 5, 2, 11, 2, 7, 2, 3, 2, 7, 3, 11, 3, 2, 2, 5, 3, 2, 11, 2, 5, 2, 3, 7, 3, 2, 5, 2, 3, 5, 2, 7, 11, 2, 3, 3, 7, 2, 3, 2, 11, 5, 2, 5, 2, 3, 7, 2, 0, 3, 2, 3, 5, 11, 2, 3, 101, 7, 5, 2, 11, 3, 2, 5, 7, 2, 3, 0, 2, 5, 3, 0, 3, 11, 2, 7, 131, 5, 3, 2, 2, 7, 0, 3, 5, 2, 0, 7, 151, 101, 5

Offset

1,1

Links

Table of n, a(n) for n=1..98.

Formula

a(n) = A180506(A001358(n)). - R. J. Mathar, Sep 19 2010

Crossrefs

Sequence in context: A373751 A066072 A239586 * A084127 A377214 A089934

Adjacent sequences: A180608 A180609 A180610 * A180612 A180613 A180614

Keyword

base,nonn

Author

Giovanni Teofilatto, Sep 12 2010

Extensions

Missing term inserted by R. J. Mathar, Sep 19 2010

Status

approved