A068134 - OEIS

%I #11 Jan 29 2024 17:37:31

%S 0,1,2,3,7,12,56,109,368,1332,5656,28248,140547,774325,8485151,

%T 34339452,397492132,3996973827,63229707890,1039037824132

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

%Y Cf. A068133.

%K base,more,nonn

%O 0,3

%A _Amarnath Murthy_, Feb 21 2002

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

%E a(18), a(19) from _Max Alekseyev_, Jun 19 2011

%E a(0)=0 inserted by _Sean A. Irvine_, Jan 29 2024