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1, 3, 6, 10, 15, 22, 30, 39, 49, 60, 73, 87, 102, 118, 135, 154, 175, 197, 220, 245, 271, 298, 327, 358, 390, 423, 457, 492, 529, 567, 606, 647, 690, 734, 779, 825, 872, 921, 971, 1022, 1074, 1127, 1182, 1239, 1297, 1356, 1417, 1479, 1542, 1606, 1671, 1738, 1806, 1875, 1946
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Accumulate[Select[Range[100], DivisorSigma[1, #]<2#&]] (* Harvey P. Dale, Apr 11 2011 *)
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PROG
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(GAP) D:=Filtered([1..80], n->Sigma(n)<2*n);;
a:=List([1..Length(D)], i->Sum([1..i], j->D[j])); # Muniru A Asiru, Jun 08 2018
(PARI) lista(nn) = {my(s = 0); for (n=1, nn, if (sigma(n) < 2*n, s += n; print1(s, ", ")); ); } \\ Michel Marcus, Jun 09 2018
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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