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

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

Keywords

• nonn

Examples

			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
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Amicable Pair.

Crossrefs

Cf. A002025, A002046.

Formula

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

Extensions

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