A158992 -id:A158992 - cp's OEIS frontend

A158994 Denominator of Bernoulli(n, 1/10).

1, 5, 300, 250, 30000, 25000, 21000000, 2500000, 300000000, 250000000, 330000000000, 25000000000, 273000000000000, 2500000000000, 300000000000000, 250000000000000, 510000000000000000, 25000000000000000

Offset: 0

N. J. A. Sloane, Nov 08 2009

Vincenzo Librandi, Table of n, a(n) for n = 0..250

For numerators see A158992.

Table[Denominator[BernoulliB[n, 1/10]], {n, 0, 50}] (* Vincenzo Librandi, Mar 19 2014 *)

A158989 Numbers n such that product of double factorials of the digits of n equals sigma(n).

Original entry on oeis.org

1, 54, 62, 4190, 4920, 10538, 12376, 16065, 16732, 26345, 37236, 47026, 48323, 53480, 56712, 58520, 61209, 62337, 65163, 83720, 84135, 94520, 100980, 126238, 135266, 141078, 143726, 146910, 147354, 154238, 174217, 183505, 185334, 207328

Offset: 1

Farideh Firoozbakht, Jul 07 2009

			sigma(444119)=4!!*4!!*4!!*1!!*1!!*9!!, so 444119 is in the sequence.

Cf. A137603, A158990, A158991, A158992.

Select[Range[210000],DivisorSigma[1,# ]==Apply[Times,IntegerDigits[ # ]!! ]&]

cp's OEIS Frontend

A158994 Denominator of Bernoulli(n, 1/10).

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