1,1

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

a(n) = sum_{i=1..A045345(n)} A000040(i). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 26 2008

Cf. A045345, A050248.

Sequence in context: A145748 A141185 A128667 this_sequence A159705 A159723 A070967

Adjacent sequences: A050244 A050245 A050246 this_sequence A050248 A050249 A050250

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Eric Weisstein (eric(AT)weisstein.com)