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 Dec 01 2021 03:54:35
%S 3,6,6,10,15,15,21,21,28,36,36,45,45,45,55,55,66,66,78,78,78,91,91,91,
%T 105,105,105,120,120,120,136,136,153,153,153,153,171,171,171,190,190,
%U 190,210,210,210,210,231,231,231,231,253,253,253,253,276,276,276,276
%N a(n) is the smallest triangular number > n-th prime.
%t a1 = Reap[Do[p = Prime[m]; Do[t = n (n + 1)/2; If[t > p, Sow[t]; Break[]], {n, 200}], {m, 100}]][[2, 1]]
%Y Cf. A097050 (smallest prime > n-th triangular number).
%Y Cf. A000040, A000217.
%K nonn
%O 1,1
%A _Zak Seidov_, Nov 15 2008