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Search: id:A063981
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| 2, 4, 9, 16, 81, 85, 256, 931, 65536, 4599097, 6309263, 16905401, 43046721, 54116239, 68229263, 98643563, 208288271, 222933913, 226461649, 230893123, 280399957, 381001633, 412016873, 417814973, 485674237, 620336281, 736284077
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OFFSET
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1,1
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MATHEMATICA
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a = 0; b = 0; Do[a = b; b = Apply[ Plus, Transpose[ FactorInteger[n + 1]] [[1]]]; If[ b - a == DivisorSigma[1, n] - n, Print[n]], {n, 1, 2*10^7} ]
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CROSSREFS
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Cf. A008472, A001065.
Sequence in context: A056331 A056336 A060401 this_sequence A131095 A136379 A065026
Adjacent sequences: A063978 A063979 A063980 this_sequence A063982 A063983 A063984
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Sep 05 2001
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 05 2001
a(14)-a(27) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 13 2009
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