A137345 a(n) = binomial( n(n+1)/2, n) mod n.

0, 1, 2, 2, 3, 0, 4, 4, 5, 0, 6, 7, 7, 0, 9, 8, 9, 0, 10, 0, 3, 0, 12, 6, 13, 13, 5, 0, 15, 4, 16, 16, 24, 0, 20, 12, 19, 0, 4, 38, 21, 0, 22, 22, 30, 0, 24, 12, 25, 25, 18, 0, 27, 0, 45, 51, 51, 0, 30, 0, 31, 0, 35, 32, 35, 0, 34, 0, 33, 10, 36, 0, 37, 0, 39, 57, 14, 0, 40, 12, 5, 0, 42, 40

Offset

1,3

Links

Table of n, a(n) for n=1..84.

Formula

a(n) = A014068(n) mod n. - R. J. Mathar, Apr 09 2008

Maple

P:=proc(n) local a, b, i; a:=0; for i from 1 by 1 to n do a:=a+i; b:=(binomial(a, i) mod i); print(b); od; end: P(101);

Crossrefs

Cf. A139125.

Sequence in context: A095201 A272143 A095058 * A060755 A104594 A079626

Adjacent sequences: A137342 A137343 A137344 * A137346 A137347 A137348

Keyword

easy,nonn

Author

Paolo P. Lava and Giorgio Balzarotti, Apr 08 2008, Apr 14 2008

Status

approved