The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #5 Dec 15 2017 17:36:04
%S 1,3,6,12,19,21,28,36,51,54,55,63,66,82,87,91,99,102,132,147,153,165,
%T 168,171,252,307,309,351,352,379,381,417,423,451,501,505,523,534,564,
%U 577,582,594,595,604,613,627,631,645,649,654,666,672,694,753,766,771
%N Triangular numbers written backwards and sorted, duplicates removed.
%Y Cf. A004158.
%K base,nonn
%O 1,2
%A _Jason Earls_, Sep 14 2002