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A079783 Sum of n-th row of triangle in A079784. 4
2, 9, 30, 38, 285, 339, 2912, 6684, 22635, 25145, 304854, 332562, 4684589, 5044935, 5405280, 11531384, 208287927, 220540149, 4423058450, 4655850990, 4888643529, 5121436067, 123147263964, 128501492820, 669278609675, 696049754049, 2168462696022, 2248776129194 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

FORMULA

A079783(n) = n*[A079782(n)-(n-1)/2]. - R. J. Mathar, Nov 12 2006

EXAMPLE

The fifth row 55,56,57,58,59 is divisible by 5,4,3,2 and 1 respectively.

PROG

(PARI) okrow(m, n) = {v = vector(n, i, i+m-1); for (i=1, n, if (v[i] % (n-i+1), return (0)); ); return (1); }

a(n) =  {m = n+1; while (! okrow(m, n), m++); sum(k=1, n, m+k-1); } \\ Michel Marcus, Feb 28 2014

CROSSREFS

Cf. A079781, A079782, A079784.

Sequence in context: A150904 A122675 A042357 * A182975 A228932 A196421

Adjacent sequences:  A079780 A079781 A079782 * A079784 A079785 A079786

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Feb 03 2003

EXTENSIONS

More terms from Michel Marcus, Feb 28 2014

STATUS

approved

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Last modified October 21 09:55 EDT 2021. Contains 348150 sequences. (Running on oeis4.)