Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
Table of n, a(n) for n=1..24.
G. P. Michon, Never Back to -1.
a(13)=181 because A077020(26)=181 is the 13th prime value found in that sequence; A001607(26)=-181.
Sequence in context: A130142 A130139 A204938 * A134487 A064537 A023899
Adjacent sequences: A101085 A101086 A101087 * A101089 A101090 A101091
Gerard P. Michon, Dec 01 2004