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 A080429 #14 Jul 08 2025 06:11:40
%S A080429 1,3,5,7,9,11,13,17,19,23,25,29,31,37,41,43,47,49,53,59,61,67,71,73,
%T A080429 79,81,83,89,97,101,103,105,107,109,113,121,127,131,137,139,149,151,
%U A080429 157,163,167,169,173,179,181,191,193,197,199,211,223,227,229,233,239,241
%N A080429 Odd numbers such that all a(i)*a(j) with i<j are distinct.
%e A080429 49 belongs to this sequence but 45 does not as 45*1 = 9*5.
%p A080429 S := {3}: A := array(1..10^3): for m from 1 to 10^3 do A[m] := 0 od: A[1] := 1: A[3] := 3: for n from 5 to 10^3-1 by 2 do mytest := 0: for j from 1 to n-2 by 2 do if A[j]>0 then if member(A[j]*n, S) then mytest := 1; break; fi:fi:od: if mytest=0 then A[n] := n; for j from 1 to n-2 by 2 do S := S union {A[j]*n} od: fi: od: for i from 1 to 10^3-1 by 2 do if A[i]>0 then printf(`%d,`, A[i]) fi: od: # _James Sellers_, Feb 25 2003
%Y A080429 Distinct from A062090.
%K A080429 nonn
%O A080429 1,2
%A A080429 _Amarnath Murthy_, Feb 20 2003
%E A080429 More terms from _James Sellers_, Feb 25 2003