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Search: id:A139237
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| A139237 |
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Second differences of even superperfect numbers A061652, divided by 2. |
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+0
13
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OFFSET
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1,1
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COMMENT
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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.
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FORMULA
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a(n) = A139236(n)/2.
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CROSSREFS
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Cf. A000668, A019279, A061652, A139228, A139229, A139230, A139231, A139232, A139233, A139234, A139235, A139236.
Adjacent sequences: A139234 A139235 A139236 this_sequence A139238 A139239 A139240
Sequence in context: A140296 A091059 A139243 this_sequence A089082 A106229 A129734
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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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