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A139232
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Second differences of Mersenne primes A000668.
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10
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OFFSET
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1,1
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COMMENTS
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Second differences of even superperfect numbers, multiplied by 2 (see A139236).
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LINKS
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Table of n, a(n) for n=1..6.
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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, A139233, A139234, A139235, A139236, A139237.
Sequence in context: A083873 A143854 A139241 * A002292 A225923 A010008
Adjacent sequences: A139229 A139230 A139231 * A139233 A139234 A139235
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol, Apr 19 2008
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STATUS
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approved
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