Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #12 Feb 03 2013 02:54:44
%S 1,2,3,7,8,15,24,32,35,63,80,104,224,384,560,935,1224,1664,1728,2015,
%T 2079,5984,12375,14399,21735,41040,78624,98175,123200,126224,165375,
%U 201824,313599,395199,453375,1056159,1154439,1324224,1890944,2203200,2756159,6969599
%N Indices of highly composite triangular numbers.
%H Charles R Greathouse IV and Donovan Johnson, <a href="/A101755/b101755.txt">Table of n, a(n) for n = 1..70</a> (first 55 terms from _Charles R Greathouse IV_).
%F A000217(a(n)) = A076711(n).
%o (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
%Y Cf. A076711, A101756.
%K nonn
%O 1,2
%A _Ray Chandler_, Dec 22 2004