|
|
A139234
|
|
First differences of even superperfect numbers A061652.
|
|
10
|
|
|
2, 12, 48, 4032, 61440, 196608, 1073479680, 1152921503533105152, 309485008668423564117934080, 81129328929596860350720280363008, 85070510600596201259161956068936908800
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
First differences of Mersenne primes A000668, divided by 2 (see A139231).
Also, first differences of superperfect numbers A019279, if there are no odd superperfect numbers.
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
a(2) = 12 because A061652(2) = 4 and A061652(3) = 16 then 16 - 4 = 12.
|
|
MATHEMATICA
|
Differences[Table[2^(MersennePrimeExponent[n]-1), {n, 12}]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 18 2020 *)
|
|
CROSSREFS
|
Cf. A000668, A019279, A061652, A139228, A139229, A139230, A139231, A139232, A139233, A139235, A139236, A139237.
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|