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A166668 Totally multiplicative sequence with a(p) = 10p+1 for prime p. 1
1, 21, 31, 441, 51, 651, 71, 9261, 961, 1071, 111, 13671, 131, 1491, 1581, 194481, 171, 20181, 191, 22491, 2201, 2331, 231, 287091, 2601, 2751, 29791, 31311, 291, 33201, 311, 4084101, 3441, 3591, 3621, 423801, 371, 4011, 4061, 472311, 411, 46221, 431 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

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 @@ ((10*fi[[All, 1]] + 1)^fi[[All, 2]])); Table[a[n], {n, 1, 100}] (* G. C. Greubel, May 22 2016 *)

CROSSREFS

Sequence in context: A243360 A068657 A068671 * A019423 A002639 A054282

Adjacent sequences:  A166665 A166666 A166667 * A166669 A166670 A166671

KEYWORD

nonn,mult

AUTHOR

Jaroslav Krizek, Oct 18 2009

STATUS

approved

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Last modified July 24 03:01 EDT 2019. Contains 325290 sequences. (Running on oeis4.)