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A134709 Even superperfect numbers divided by 2, minus 1. 1

%I #5 Mar 14 2020 05:55:37

%S 0,1,7,31,2047,32767,131071,536870911,576460752303423487,

%T 154742504910672534362390527,40564819207303340847894502572031,

%U 42535295865117307932921825928971026431

%N Even superperfect numbers divided by 2, minus 1.

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

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

%Y Cf. A019279, A061652, A133028.

%K nonn

%O 1,3

%A _Omar E. Pol_, Nov 07 2007

%E More terms from _Jinyuan Wang_, Mar 14 2020

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Last modified July 13 14:24 EDT 2024. Contains 374284 sequences. (Running on oeis4.)