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A013752
a(n) = 13^(3*n + 1).
2
13, 28561, 62748517, 137858491849, 302875106592253, 665416609183179841, 1461920290375446110677, 3211838877954855105157369, 7056410014866816666030739693, 15502932802662396215269535105521, 34059943367449284484947168626829637, 74829695578286078013428929473144712489
OFFSET
0,1
FORMULA
From Philippe Deléham, Nov 30 2008: (Start)
a(n) = 2197*a(n-1); a(0)=13.
G.f.: 13/(1-2197*x).
a(n) = A013753(n)/13. (End)
E.g.f.: 13*exp(13^3*x). - Stefano Spezia, Aug 29 2024
MATHEMATICA
NestList[2197*# &, 13, 15] (* Paolo Xausa, Aug 28 2024 *)
PROG
(Magma) [13^(3*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 27 2011
(PARI) a(n)=13^(3*n+1) \\ Charles R Greathouse IV, Jun 27 2011
CROSSREFS
Subsequence of A001022.
Cf. A013753.
Sequence in context: A123921 A145716 A124990 * A076811 A203691 A220981
KEYWORD
nonn,easy
STATUS
approved