A180066 Smallest prime factor of 2-strong pseudoprimes.

23, 29, 37, 31, 53, 7, 13, 127, 157, 7, 97, 5, 61, 53, 149, 151, 229, 137, 157, 103, 43, 41, 157, 233, 151, 277, 13, 131, 313, 277, 11, 233, 157, 359, 499, 13, 79, 431, 5, 101, 397, 661, 307, 479, 313, 331, 13, 251, 11, 601, 103, 1093, 449, 409, 733, 571, 499, 673, 829

Offset: 1

Author

Kevin Batista (kevin762401(AT)yahoo.com), Aug 09 2010

Keywords

• nonn

Examples

			The 8th pseudoprime, 42799, is divisible by 127.
		

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
• Index entries for sequences related to pseudoprimes

Formula

a(n) = A020639(A001262(n)).

Extensions

b-file and edits from Charles R Greathouse IV, Aug 28 2010