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Search: id:A139235
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| A139235 |
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First differences of even superperfect numbers A061652, divided by 2. |
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+0
11
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OFFSET
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1,2
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COMMENT
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First differences of Mersenne primes A000668, divided by 4 (See A139231).
Also, first differences of superperfect numbers A019279, divided by 2, if there are no odd superperfect numbers.
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FORMULA
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a(n) = A139234(n)/2.
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CROSSREFS
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Cf. A000668, A019279, A061652, A139228, A139229, A139230, A139231, A139232, A139233, A139234, A139236, A139237.
Sequence in context: A139240 A052524 A036284 this_sequence A136606 A074096 A126016
Adjacent sequences: A139232 A139233 A139234 this_sequence A139236 A139237 A139238
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Apr 18 2008
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