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A139237
Second differences of even superperfect numbers A061652, divided by 2.
13
5, 18, 1992, 28704, 67584, 536641536, 576460751229812736, 154742503757751030292414464, 40564509722294095963578081214464, 42535214735633635831150802674328272896
OFFSET
1,1
COMMENTS
Second differences of Mersenne primes A000668, divided by 4 (see A139232).
Also, second differences of superperfect numbers A019279, divided by 2, if there are no odd superperfect numbers.
LINKS
FORMULA
a(n) = A139236(n)/2.
MATHEMATICA
Differences[2^MersennePrimeExponent[Range[14]]-1, 2]/4 (* Paolo Xausa, Oct 20 2023 *)
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 18 2008
EXTENSIONS
More terms from Michel Marcus, Jul 09 2017
STATUS
approved