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6, 10, 14, 15, 20, 21, 22, 24, 26, 27, 28, 30, 33, 34, 35, 38, 39, 40, 42, 44, 45, 46, 49, 51, 54, 55, 56, 57, 58, 60, 62, 63, 65, 66, 68, 69, 70, 74, 76, 77, 78, 82, 85, 86, 87, 88, 91, 92, 93, 94, 95, 96, 99, 102, 104, 105, 106, 108, 110, 111, 114, 115, 116, 117, 118, 119
(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..66.
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EXAMPLE
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n=27:d(27)=4, sigma[27]=1+3+9+27=40,d[40]=8>d[27];
27 is not in A069116
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MATHEMATICA
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df[x_] := Sign[ -DivisorSigma[0, x]+DivisorSigma[0, DivisorSigma[1, x]]] Do[s=df[n]; If[Equal[s, 1]&&!PrimeQ[n], Print[n]], {n, 1, 1000}]
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CROSSREFS
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Cf. A000005, A000203, A069116, A073803, A073804, A037197.
Sequence in context: A132982 A069169 A080364 * A069116 A063763 A115956
Adjacent sequences: A082089 A082090 A082091 * A082093 A082094 A082095
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 10 2003
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STATUS
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approved
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