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A112544 Denominators of fractions n/m in array by antidiagonals. 1
1, 1, 2, 1, 1, 3, 1, 2, 3, 4, 1, 1, 1, 2, 5, 1, 2, 3, 4, 5, 6, 1, 1, 3, 1, 5, 3, 7, 1, 2, 1, 4, 5, 2, 7, 8, 1, 1, 3, 2, 1, 3, 7, 4, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 1, 1, 1, 5, 1, 7, 2, 3, 5, 11, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 1, 3, 2, 5, 3, 1, 4, 9, 5, 11, 6, 13, 1, 2, 1, 4, 1, 2, 7, 8, 3 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..100.

PROG

(PARI) t1(n)=binomial(floor(3/2+sqrt(2*n)), 2)-n+1 t2(n)=n-binomial(floor(1/2+sqrt(2*n)), 2) vector(100, n, t2(n)/gcd(t1(n), t2(n)))

CROSSREFS

Numerators in A112543. See comments and references there.

Sequence in context: A188542 A029284 A123275 * A198789 A134521 A131375

Adjacent sequences:  A112541 A112542 A112543 * A112545 A112546 A112547

KEYWORD

easy,frac,nonn,tabl

AUTHOR

Franklin T. Adams-Watters, Sep 11 2005

EXTENSIONS

Keyword tabl added by Franklin T. Adams-Watters, Sep 02 2009

STATUS

approved

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Last modified December 12 07:31 EST 2019. Contains 329948 sequences. (Running on oeis4.)