%I A018801
%S A018801 1,6,2,9,10,3,12,40,13,4,47,15,16,53,5,57,18,60,19,63,6,66,21,69,22,72,
%T A018801 23,7,76,24,79,25,81,82,26,8,27,87,88,28,91,92,29,94,9,30,97,98,31,100,
%U A018801 101,32,103,104,10,33,107,108,34,346,110,111,35,113,114,11,116,369,117
%N A018801 Index of smallest triangular number beginning with n.
%Y A018801 Cf. A018855.
%Y A018801 Sequence in context: A118388 A142871 A050235 this_sequence A055021 A141379 
               A100616
%Y A018801 Adjacent sequences: A018798 A018799 A018800 this_sequence A018802 A018803 
               A018804
%K A018801 nonn,base
%O A018801 1,2
%A A018801 N. J. A. Sloane (njas(AT)research.att.com), David W. Wilson (davidwwilson(AT)comcast.net)