A051595 Minimal elements of pairs of "(-1)sigma amicable numbers", sorted by their minimal elements.

429552, 497808, 800496, 2472912, 3329712, 4925808, 5033808, 5470632, 5756616, 7584408, 7696368, 8498952, 13172000, 14484816, 16112304, 17901936, 18349776, 20867184, 21395600, 21895920, 22581000, 24395200, 24805872, 27369900

Offset

0,1

Links

Table of n, a(n) for n=0..23.

Formula

(-1)sigma(a) = (-1)sigma(b) = a+b where a<b. Here (-1)sigma(n) = A049060(n): If n = Product p(i)^r(i) then (-1)sigma(n) = Product(-1+Sum p(i)^s, s=1 to r(i)). This sequence gives the values of a; A051594 gives the values of b.

Crossrefs

Cf. A051594, A049060.

Sequence in context: A234448 A269798 A251639 * A234857 A186593 A328197

Adjacent sequences: A051592 A051593 A051594 * A051596 A051597 A051598

Keyword

nonn

Author

Yasutoshi Kohmoto

Extensions

Edited by Dean Hickerson, Nov 06 2006

More terms from Max Alekseyev, Jan 31 2010

Status

approved