A171092 Smallest prime factor of smaller of amicable pair.

2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 2, 2

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Amicable Pair.

Formula

a(n) = A020639(A002025(n)).

Example

The example 5480828320492525 shows that the sequence contains a 5. - Charles R Greathouse IV, Aug 16 2010
Does it contain a 7?  Does it contain all primes? - Charles R Greathouse IV, Jan 28 2011

Crossrefs

Cf. A002025, A002046.

Sequence in context: A320011 A068049 A297850 * A141256 A122921 A174273

Adjacent sequences: A171089 A171090 A171091 * A171093 A171094 A171095

Keyword

nonn

Author

N. J. A. Sloane, Sep 08, 2010, based on a posting to the Sequence Fans Mailing List by Jonathan Vos Post, Aug 16 2010

Extensions

More terms from R. J. Mathar, Robert G. Wilson v and John W. Layman, Sep 09 2010

Status

approved