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A166659
Totally multiplicative sequence with a(p) = 10p-1 for prime p.
1
1, 19, 29, 361, 49, 551, 69, 6859, 841, 931, 109, 10469, 129, 1311, 1421, 130321, 169, 15979, 189, 17689, 2001, 2071, 229, 198911, 2401, 2451, 24389, 24909, 289, 26999, 309, 2476099, 3161, 3211, 3381, 303601, 369, 3591, 3741, 336091, 409, 38019, 429
OFFSET
1,2
LINKS
FORMULA
Multiplicative with a(p^e) = (10p-1)^e. If n = Product p(k)^e(k) then a(n) = Product (10*p(k)-1)^e(k).
MATHEMATICA
a[1] = 1; a[n_] := (fi = FactorInteger[n]; Times @@ ((9*fi[[All, 1]] - 1)^fi[[All, 2]])); Table[a[n], {n, 1, 100}] (* G. C. Greubel, May 21 2016 *)
CROSSREFS
Sequence in context: A276732 A038542 A269262 * A298763 A309962 A316678
KEYWORD
nonn,mult
AUTHOR
Jaroslav Krizek, Oct 18 2009
STATUS
approved