A180163 Products of pairs of amicable numbers (see A063990).

62480, 1432640, 7660880, 27931280, 39685376, 116636864, 179299575, 318523136, 4217802560, 4494828240, 4952759175, 6067699000, 7775676090, 12285798525, 15069863936, 17358731325, 20160203840, 25845386480, 30293400832

Offset

1,1

Comments

For a more reasonable sequence, in which both factors always belong to the same amicable pair, see A180202, which first differs from this sequence at a(9). - Omar E. Pol, Oct 25 2017

Links

Table of n, a(n) for n=1..19.

Formula

a(n) = A063990(2*n-1) * A063990(2*n).

Example

a(1) = 220 * 284 = 62480 = 2^4 * 5 * 11 * 71.
a(2) = 1184 * 1210 = 1432640 = 2^6 * 5 * 11^2 * 37.

Crossrefs

Cf. A002025, A002046, A063990, A161005, A180202, A259180.

Sequence in context: A181114 A242620 A203046 * A180202 A031659 A257150

Adjacent sequences: A180160 A180161 A180162 * A180164 A180165 A180166

Keyword

easy,nonn,less

Author

Jonathan Vos Post, Aug 14 2010

Status

approved