1,3

a(n)=(A061652(n)/2) - 1.

a(5)=2047 because the 5th even superperfect number is 4096 and (4096/2)-1=2047.

Cf. A019279, A061652, A133028.

Adjacent sequences: A134706 A134707 A134708 this_sequence A134710 A134711 A134712

Sequence in context: A135630 A139287 A139307 this_sequence A139314 A101329 A067811

more,nonn

Omar E. Pol (info(AT)polprimos.com), Nov 07 2007