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A073872 Smallest positive triangular number not included earlier that is a multiple of n (a permutation of the triangular numbers). 2
1, 6, 3, 28, 10, 36, 21, 120, 45, 190, 55, 276, 78, 210, 15, 496, 136, 378, 171, 300, 105, 66, 253, 528, 325, 780, 351, 1176, 406, 630, 465, 2016, 231, 1326, 595, 2556, 666, 1596, 741, 2080, 820, 3486, 903, 1540, 990, 2346, 1081, 4560, 1225, 2850, 153, 5356 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..52.

MATHEMATICA

a[n_] := a[n]=Module[{s, k, t}, s=a/@Range[1, n-1]; For[k=t=1, True, t+=++k, If[Mod[t, n]==0&&!MemberQ[s, t], Return[t]]]]

CROSSREFS

Cf. A073873, A073874.

Sequence in context: A287546 A285559 A066561 * A281677 A282303 A286166

Adjacent sequences:  A073869 A073870 A073871 * A073873 A073874 A073875

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Aug 16 2002

EXTENSIONS

Edited by Dean Hickerson, Oct 15 2002

STATUS

approved

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Last modified June 1 19:32 EDT 2020. Contains 334762 sequences. (Running on oeis4.)