A029934 Denominator of n * Product_{d|n} (1 + 1/d).

1, 1, 1, 1, 1, 1, 1, 4, 3, 5, 1, 6, 1, 7, 5, 32, 1, 27, 1, 20, 21, 11, 1, 64, 5, 13, 27, 49, 1, 375, 1, 512, 11, 17, 35, 5832, 1, 19, 39, 3200, 1, 147, 1, 242, 135, 23, 1, 24576, 7, 625, 17, 676, 1, 6561, 55, 10976, 57, 29

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A029933 (numerators).

Programs

Maple

with(numtheory): f := proc(n) local i,j; j := n; for i in divisors(n) do j := j*(1+1/i); od; end;

Mathematica

dp[n_]:=Denominator[n*Times@@(1+1/#&/@Divisors[n])]; Array[dp,60] (* Harvey P. Dale, Mar 23 2012 *)