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A241030
Sum of n-th powers of divisors of 26.
2
4, 42, 850, 19782, 485554, 12252702, 313742650, 8094558822, 209642795554, 5440108178862, 141304954146250, 3672136647383862, 95452254746808754, 2481455748310337022, 64513912079682866650, 1677310528178740048902, 43609408316038057305154
OFFSET
0,1
FORMULA
G.f.: 2*(2 - 63*x + 457*x^2 - 546*x^3)/((1 - x)*(1 - 2*x)*(1 - 13*x)*(1 - 26*x)).
a(n) = (1 + 2^n)*(1 + 13^n).
MATHEMATICA
Total[#^Range[0, 20] & /@ Divisors[26]] (* or *) Table[(1 + 2^n) (1 + 13^n), {n, 0, 20}]
PROG
(Magma) [DivisorSigma(n, 26): n in [0..20]];
CROSSREFS
Cf. similar sequences listed in A241029.
Sequence in context: A197323 A197976 A338194 * A143990 A352074 A267616
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 17 2014
STATUS
approved