A076146 a(1) = 1; a(n) = a(n-1)*prime(a(n-1)).

1, 2, 6, 78, 30966, 11234495766, 3197149582479668022558

Offset: 1

Author

Zak Seidov, Nov 02 2002

Keywords

• nonn
• hard
• more

Comments

Previous term * prime(previous term). Previous term + prime(previous term) is A074271.

Matula-Goebel numbers of the finite ordinal numbers; see also A007097. - Gus Wiseman, Aug 30 2016

Crossrefs

Cf. A033286, A074271, A007097, A000040, A004111, A348067.

Programs

Mathematica

NestList[# Prime@ # &, 1, 6] (* Michael De Vlieger, Aug 30 2016 *)

Extensions

a(7) from Gus Wiseman, Aug 30 2016