A101755 Indices of highly composite triangular numbers.

1, 2, 3, 7, 8, 15, 24, 32, 35, 63, 80, 104, 224, 384, 560, 935, 1224, 1664, 1728, 2015, 2079, 5984, 12375, 14399, 21735, 41040, 78624, 98175, 123200, 126224, 165375, 201824, 313599, 395199, 453375, 1056159, 1154439, 1324224, 1890944, 2203200, 2756159, 6969599

Offset

1,2

Links

Charles R Greathouse IV and Donovan Johnson, Table of n, a(n) for n = 1..70 (first 55 terms from Charles R Greathouse IV).

Formula

A000217(a(n)) = A076711(n).

Prog

(PARI) r=0; for(n=1, 1e7, t=if(n%2, numdiv(n)*numdiv((n+1)/2), numdiv(n/2)*numdiv(n+1)); if(t>r, r=t; print1(n", "))) \\ Charles R Greathouse IV, Feb 01 2013

Crossrefs

Cf. A076711, A101756.

Sequence in context: A071527 A307328 A097095 * A363847 A076550 A062269

Adjacent sequences: A101752 A101753 A101754 * A101756 A101757 A101758

Keyword

nonn

Author

Ray Chandler, Dec 22 2004

Status

approved