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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 June 17 05:47 EDT 2024. Contains 373432 sequences. (Running on oeis4.)