This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
1 3 4 9 10 12 13 27 28 30 31 36 37 39 40 ?
series/series.25.s
1 3 4 9 10 12 13 27 28 30 31 36 37 39 40 ...
Positive integers in binary, treated as a base 3 number and converted
to decimal.
 
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