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A166661
Totally multiplicative sequence with a(p) = 3p+1 for prime p.
2
1, 7, 10, 49, 16, 70, 22, 343, 100, 112, 34, 490, 40, 154, 160, 2401, 52, 700, 58, 784, 220, 238, 70, 3430, 256, 280, 1000, 1078, 88, 1120, 94, 16807, 340, 364, 352, 4900, 112, 406, 400, 5488, 124, 1540, 130, 1666, 1600, 490, 142, 24010, 484, 1792
OFFSET
1,2
LINKS
FORMULA
Multiplicative with a(p^e) = (3p+1)^e. If n = Product p(k)^e(k) then a(n) = Product (3*p(k)+1)^e(k).
MATHEMATICA
a[1] = 1; a[n_] := (fi = FactorInteger[n]; Times @@ ((3*fi[[All, 1]] + 1)^fi[[All, 2]])); Table[a[n], {n, 1, 100}] (* G. C. Greubel, May 22 2016 *)
CROSSREFS
Sequence in context: A056510 A013398 A013493 * A025632 A038276 A249952
KEYWORD
nonn,mult
AUTHOR
Jaroslav Krizek, Oct 18 2009
STATUS
approved