This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A132132 #4 Mar 30 2012 18:34:45 %S A132132 12,21,23,31,34,41,45,51,56,61,67,71,78,81,89,91,101,110,121,131,141, %T A132132 151,161,171,181,191,201,210,231,241,251,261,271,281,291,301,310,341, %U A132132 351,361,371,381,391,401,410,451,461,471,481,491,501,510,561,571,581 %N A132132 "Early Bird" numbers n such that n-1 is not an Early Bird (cf. A116700). %C A132132 Punctual Birds (A131881) are all numbers k with A132131(n) <= k < A132132(n) for some n Early Birds (A116700) are all numbers k with A132132(n) <= k < A132131(n+1) for some n %H A132132 Graeme McRae, <a href="/A132132/b132132.txt">Table of n, a(n) for n = 1..27348</a> %e A132132 a(1)=12 because 12 is the first Early Bird. %e A132132 a(2)=21 because 21 is the second Early Bird. %e A132132 a(3)=23 because 23 is the third Early Bird. %e A132132 a(4)=31 because 31 is the fourth Early Bird. %e A132132 a(5)=34 because 31-32 are Early Birds and 33 is not an Early Bird. %Y A132132 Cf. A033307, A117804, A116700, A131881, A132131, A132133. %K A132132 base,nonn %O A132132 1,1 %A A132132 _Graeme McRae_, Aug 11 2007