A068134 Index of the smallest triangular number with digit sum = n-th triangular number.

0, 1, 2, 3, 7, 12, 56, 109, 368, 1332, 5656, 28248, 140547, 774325, 8485151, 34339452, 397492132, 3996973827, 63229707890, 1039037824132, 10853561442116, 305279835527631, 4240235842471234, 117388244641426491, 3997445934568646292, 99999889989926488708

Offset

0,3

Links

Table of n, a(n) for n=0..25.

Crossrefs

Cf. A068133.

Sequence in context: A056294 A084423 A361910 * A249051 A329413 A225093

Adjacent sequences: A068131 A068132 A068133 * A068135 A068136 A068137

Keyword

base,nonn

Author

Amarnath Murthy, Feb 21 2002

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Jun 17 2002

a(18)-a(19) from Max Alekseyev, Jun 19 2011

a(0)=0 inserted by Sean A. Irvine, Jan 29 2024

a(20)-a(25) from Max Alekseyev, May 25 2025

Status

approved