1,2

a(n) is > the n-th triangular number. Conjecture: There are no composite members.

Cf. A081516, A081517.

Sequence in context: A119992 A023249 A090513 this_sequence A023234 A134707 A047838

Adjacent sequences: A081512 A081513 A081514 this_sequence A081516 A081517 A081518

nonn,more

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 27 2003

a(7)-a(9) from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 23 2007