A074271 Previous term + prime(previous term).

1, 3, 8, 27, 130, 863, 7554, 84385, 1165814, 19408513, 381328184, 8690396907, 226500350374, 6671888768963, 219904832427160, 8040978338951561, 323784549401655250, 14264968083112608087

Offset

1,2

Links

Table of n, a(n) for n=1..18.

Formula

a(1)=1; a(n)=a(n-1)+prime(a(n-1)).

Example

a(4)=27 because a(3)=8, prime(8)=19 and 8+19=27.

Mathematica

se={1}; a=1; Do[b=a+Prime[a]; se=Append[se, b]; a=b, {i, 13}]; se
NestList[ Prime@# + # &, 1, 14] (* Robert G. Wilson v, Jul 17 2010 *)

Crossrefs

Cf. A007097, A179274. - Robert G. Wilson v, Jul 17 2010

Sequence in context: A226061 A294197 A030495 * A005641 A260961 A230822

Adjacent sequences: A074268 A074269 A074270 * A074272 A074273 A074274

Keyword

nonn

Author

Zak Seidov, Sep 21 2002

Extensions

a(15) from Robert G. Wilson v, Jul 17 2010

a(16)-a(18) from Charles R Greathouse IV, Mar 15 2011

Status

approved