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3, 7, 12, 31, 42, 124, 224, 511, 847, 1953, 2688, 12264, 18816, 29127, 72540, 131071, 195048, 558523, 1077440, 3164112, 4552020, 10890040, 10342080, 54525848, 73260781, 155671040, 318848400, 1080311232, 964580240, 3070642080
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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..30.
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MATHEMATICA
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Table[DivisorSigma[1, EulerPhi[1+2^w]], {w, 1, 30}]
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CROSSREFS
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Cf. A062401, A062402, A053287, A096853-A096855.
Sequence in context: A047068 A167490 A081533 * A108154 A010260 A258136
Adjacent sequences: A096853 A096854 A096855 * A096857 A096858 A096859
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KEYWORD
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nonn
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AUTHOR
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Labos Elemer, Jul 19 2004
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STATUS
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approved
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