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A224384
a(n) = 1 + 17^n.
2
2, 18, 290, 4914, 83522, 1419858, 24137570, 410338674, 6975757442, 118587876498, 2015993900450, 34271896307634, 582622237229762, 9904578032905938, 168377826559400930, 2862423051509815794, 48661191875666868482, 827240261886336764178, 14063084452067724991010
OFFSET
0,1
COMMENTS
Sum of n-th powers of divisors of 17.
FORMULA
a(n) = A001026(n) + 1.
G.f.: 1/(1-x) + 1/(1-17*x).
E.g.f.: exp(x) + exp(17*x).
a(n) = 18*a(n-1) - 17*a(n-2) with a(0) = 2, a(1) = 18.
MATHEMATICA
17^Range[0, 20]+1 (* Harvey P. Dale, Jul 19 2019 *)
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Apr 05 2013
STATUS
approved