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A166665
Totally multiplicative sequence with a(p) = 7p+1 for prime p.
1
1, 15, 22, 225, 36, 330, 50, 3375, 484, 540, 78, 4950, 92, 750, 792, 50625, 120, 7260, 134, 8100, 1100, 1170, 162, 74250, 1296, 1380, 10648, 11250, 204, 11880, 218, 759375, 1716, 1800, 1800, 108900, 260, 2010, 2024, 121500, 288, 16500, 302, 17550
OFFSET
1,2
LINKS
FORMULA
Multiplicative with a(p^e) = (7p+1)^e. If n = Product p(k)^e(k) then a(n) = Product (7*p(k)+1)^e(k).
MATHEMATICA
a[1] = 1; a[n_] := (fi = FactorInteger[n]; Times @@ ((7*fi[[All, 1]] + 1)^fi[[All, 2]])); Table[a[n], {n, 1, 100}] (* G. C. Greubel, May 22 2016 *)
CROSSREFS
Sequence in context: A241253 A317793 A219683 * A317295 A014312 A371894
KEYWORD
nonn,mult
AUTHOR
Jaroslav Krizek, Oct 18 2009
STATUS
approved