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A076175 Denominator of sum( i+j+k = n, (i*j)/k) i,j,k >=1. 2
1, 1, 1, 2, 3, 12, 15, 30, 21, 168, 126, 1260, 990, 792, 1287, 18018, 5005, 80080, 68068, 58344, 50388, 201552, 176358, 3879876, 3432198, 27457584, 24515700, 637408200, 573667380, 16062686640, 29113619535, 26466926850, 24131609775 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
PROG
(PARI) a(n)=denominator(sum(i=1, n, sum(j=1, n, sum(k=1, n, if(n-i-j-k, 0, 1)*i*j/k))))
CROSSREFS
Cf. A076174.
Sequence in context: A173903 A154785 A090512 * A289870 A067780 A290168
KEYWORD
frac,nonn
AUTHOR
Benoit Cloitre, Nov 01 2002
STATUS
approved

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Last modified July 14 03:51 EDT 2024. Contains 374291 sequences. (Running on oeis4.)