1,3
Table of n, a(n) for n=1..10.
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.
Sequence in context: A280038 A253640 A191297 * A139314 A163083 A101329
Adjacent sequences: A134706 A134707 A134708 * A134710 A134711 A134712
more,nonn
Omar E. Pol, Nov 07 2007
approved
