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First differences of even superperfect numbers A061652, divided by 2.
11

%I #19 Mar 14 2024 18:12:05

%S 1,6,24,2016,30720,98304,536739840,576460751766552576,

%T 154742504334211782058967040,40564664464798430175360140181504,

%U 42535255300298100629580978034468454400

%N First differences of even superperfect numbers A061652, divided by 2.

%C First differences of Mersenne primes A000668, divided by 4 (see A139231).

%C Also, first differences of superperfect numbers A019279, divided by 2, if there are no odd superperfect numbers.

%H Paolo Xausa, <a href="/A139235/b139235.txt">Table of n, a(n) for n = 1..17</a>

%F a(n) = A139234(n)/2.

%t Differences[2^MersennePrimeExponent[Range[14]]-1]/4 (* _Paolo Xausa_, Oct 20 2023 *)

%Y Cf. A000668, A019279, A061652, A139228, A139229, A139230, A139231, A139232, A139233, A139234, A139236, A139237.

%K nonn

%O 1,2

%A _Omar E. Pol_, Apr 18 2008

%E a(8)-a(11) from _Jinyuan Wang_, Mar 04 2020