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A139233
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Second differences of perfect numbers A000396, divided by 2.
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10
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..8.
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FORMULA
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a(n) = A139230(n)/2.
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CROSSREFS
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Cf. A000396, A139228, A139229, A139230, A139231, A139232, A139234, A139235, A139236, A139237.
Sequence in context: A205273 A205266 A152834 * A205265 A153165 A094491
Adjacent sequences: A139230 A139231 A139232 * A139234 A139235 A139236
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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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EXTENSIONS
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a(5)-a(8) from Jinyuan Wang, Mar 04 2020
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STATUS
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approved
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