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A175410 a(n) = (b(m)-1)*b(m) = Sum_{n=b(m)+1,...,c(m)}n, b=A046174, c=A046175, m=n+1. 0
132, 27060, 5269320, 1022496552, 198362899020, 38481433358940, 7465200453136272, 1448210416843244880, 280945355811546307860, 54501950819034511436292, 10573097513564898455783640 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Solution to (b-1)*b = (c^2+2bc+c)/2.
LINKS
EXAMPLE
A046174(2) = 12, then 11*12 = 13+14+15+16+17+18+19+20 = 132, is a term. A046174(3) = 165, then 164*165 = 166+167+,....,+285 = 27060, is a term.
MATHEMATICA
lst={}; k=1; j=0; Do[b=14*k-j-2; AppendTo[lst, (b-1)*b]; j=k; k=b, {n, 1, 16}]; lst
CROSSREFS
Sequence in context: A269042 A216787 A239817 * A146522 A183500 A146545
KEYWORD
nonn
AUTHOR
Manuel Valdivia, May 05 2010
STATUS
approved

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Last modified July 22 15:40 EDT 2024. Contains 374540 sequences. (Running on oeis4.)