A166670 Totally multiplicative sequence with a(p) = 5p-2 for prime p.

1, 8, 13, 64, 23, 104, 33, 512, 169, 184, 53, 832, 63, 264, 299, 4096, 83, 1352, 93, 1472, 429, 424, 113, 6656, 529, 504, 2197, 2112, 143, 2392, 153, 32768, 689, 664, 759, 10816, 183, 744, 819, 11776, 203, 3432, 213, 3392, 3887, 904, 233, 53248, 1089, 4232

Offset

1,2

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Formula

Multiplicative with a(p^e) = (5p-2)^e. If n = Product p(k)^e(k) then a(n) = Product (5*p(k)-2)^e(k).

Mathematica

a[1] = 1; a[n_] := (fi = FactorInteger[n]; Times @@ ((5*fi[[All, 1]] - 2)^fi[[All, 2]])); Table[a[n], {n, 1, 100}] (* G. C. Greubel, May 22 2016 *)

Crossrefs

Sequence in context: A081966 A316527 A304546 * A107764 A306131 A177183

Adjacent sequences: A166667 A166668 A166669 * A166671 A166672 A166673

Keyword

nonn,mult

Author

Jaroslav Krizek, Oct 18 2009

Status

approved