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A130121
a(1)=1. a(n) = number of earlier terms of the sequence which divide n(n+1)/2.
2
1, 1, 2, 3, 3, 4, 4, 7, 4, 2, 6, 7, 4, 6, 12, 8, 4, 4, 4, 10, 6, 2, 18, 19, 2, 4, 14, 9, 4, 4, 17, 23, 5, 6, 19, 14, 4, 6, 27, 19, 6, 6, 6, 20, 7, 3, 30, 35, 7, 7, 18, 6, 7, 8, 29, 41, 9, 3, 22, 22, 2, 14, 47, 23, 7, 6, 8, 24, 17, 11, 37, 37, 4, 9, 27, 23, 14, 6, 25, 50, 12, 3, 34, 41, 5, 8, 41
OFFSET
1,3
LINKS
MAPLE
a[1]:=1: for n from 2 to 110 do a[n]:=0: for j from 1 to n-1 do if type(n*(n+1)/2/a[j], integer)=true then a[n]:=a[n]+1 else fi: od: od: seq(a[n], n=1..110); # Emeric Deutsch, May 19 2007
CROSSREFS
Cf. A130120.
Sequence in context: A320052 A168173 A095916 * A007898 A372594 A367009
KEYWORD
nonn
AUTHOR
Leroy Quet, May 10 2007
EXTENSIONS
More terms from Emeric Deutsch, May 19 2007
STATUS
approved