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 #7 Mar 19 2024 03:32:36
%S 1,3,6,10,28,36,45,78,91,105,136,406,465,561,666,703,946,1081,3240,
%T 6555,7260,9045,32640,46971,47586,48828,51360,70876,72390,94395,
%U 319600,719400,903840,914628,4862521,5092836,5112003,5131206,6898755,7108335,9122856
%N Triangular numbers k*(k+1)/2 such that A068865(k) = k*(k+1)/2.
%Y Cf. A068855, A068865.
%K base,nonn
%O 1,2
%A _Amarnath Murthy_, Mar 13 2002
%E Missing 36 inserted and more terms from _Sean A. Irvine_, Mar 18 2024