A134709 Even superperfect numbers divided by 2, minus 1.

0, 1, 7, 31, 2047, 32767, 131071, 536870911, 576460752303423487, 154742504910672534362390527, 40564819207303340847894502572031, 42535295865117307932921825928971026431

Offset: 1

Author

Omar E. Pol, Nov 07 2007

Keywords

• nonn

Examples

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

Crossrefs

Cf. A019279, A061652, A133028.

Formula

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

Extensions

More terms from Jinyuan Wang, Mar 14 2020