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A110352 A110351(n)/T(n) where T(n) is the n-th triangular number. 3
2, 1, 5, 11, 2, 4, 41, 55, 13, 17, 7, 9, 32, 1, 26, 239, 59, 67, 14, 2, 12, 104, 60, 66, 137, 149, 46, 50, 23, 25, 929, 116, 20, 5, 39, 65, 314, 40, 6, 230, 34, 36, 117, 4, 82, 494, 219, 229, 563, 54, 27, 146, 662, 97, 9, 49, 91, 797, 220, 228, 884, 11, 740, 614, 18, 122, 251 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..67.

MAPLE

A110351 := proc(n) local k ; for k from 1 to n*(n+1) do if (k*(2*n+k+1)) mod (n*(n+1)) =0 then RETURN(k*(n+(k+1)/2)) ; fi ; od ; RETURN(0) ; end: A110352 := proc(n) 2*A110351(n)/(n*(n+1)) ; end: for n from 1 to 100 do printf("%d, ", A110352(n)) ; od ; # R. J. Mathar, May 02 2007

MATHEMATICA

Do[t = n*(n + 1)/2; k = 1; While[Mod[k*n + k*(k + 1)/2, t] > 0, k++ ]; Print[(k*n + k*(k + 1)/2)/((n*(n + 1))/2)], {n, 1, 60}] (* Stefan Steinerberger, Feb 17 2006 *)

CROSSREFS

Cf. A110351, A110353.

Sequence in context: A049948 A222574 A222680 * A107310 A277279 A049950

Adjacent sequences:  A110349 A110350 A110351 * A110353 A110354 A110355

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Jul 21 2005

EXTENSIONS

More terms from Stefan Steinerberger, Feb 17 2006

More terms from R. J. Mathar, May 02 2007

STATUS

approved

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Last modified July 3 16:23 EDT 2022. Contains 355055 sequences. (Running on oeis4.)