A180202 The product of the two numbers in an amicable pair, A002025(n) * A002046(n).

62480, 1432640, 7660880, 27931280, 39685376, 116636864, 179299575, 318523136, 4794813680, 4483640576, 4773473775, 6100571295, 7076217500, 12475715175, 17094480975, 15069863936, 21699524864, 24011966300, 30304399616

Offset: 1

Author

T. D. Noe, Aug 15 2010

Keywords

• nonn

Comments

This sequence initially shares many terms with A180163 because small amicable pairs are sometimes consecutive terms in the sorted list of amicable numbers, A063990.

First differs from A180163 at a(9). - Omar E. Pol, Oct 25 2017

Examples

			a(9) = A002025(9) * A002046(9) = 63020 * 76084 = 4794813680.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from T. D. Noe)

Crossrefs

Cf. A002025, A002046, A180163, A259180.

Programs

Mathematica

s[n_] := DivisorSigma[1,n]-n; smallAmicableQ[n_] := Module[{b=s[n]}, n
				

Formula

a(n) = A259180(2n-1) * A259180(2n). - Omar E. Pol, Oct 22 2017