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A074271
Previous term + prime(previous term).
13
1, 3, 8, 27, 130, 863, 7554, 84385, 1165814, 19408513, 381328184, 8690396907, 226500350374, 6671888768963, 219904832427160, 8040978338951561, 323784549401655250, 14264968083112608087
OFFSET
1,2
FORMULA
a(1) = 1; a(n) = a(n-1) + prime(a(n-1)).
a(n) = A000720(A093502(n)). - Antti Karttunen, Nov 02 2024
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. also A007097, A179274.
Sequence in context: A226061 A294197 A030495 * A005641 A377387 A260961
KEYWORD
nonn,changed
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