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 A072125 #6 Mar 31 2012 10:26:00 %S A072125 1,4,7,10,11,12,14,16,17,18,20,22,23,24,26,28,29,32,34,35,38,40,41,44, %T A072125 46,47,53,54,59,60,65,66,70,71,72,74,76,77,78,80,82,83,84,86,88,89,92, %U A072125 94,95,98,100,101,104,106,107,113,114,119,120,125,126,130,131,132,134 %N A072125 Concatenation of first n entries (digits) of A007376 is not divisible by 3. %C A072125 Concatenation of some permutations of the n digits of A007376 is likely to be prime. %e A072125 16 is in the sequence because the 16-digit number 1234567891011121 = 1 (mod 3). %t A072125 f[0] = 0; f[n_Integer] := 10^(Floor[Log[10, n]] + 1)*f[n - 1] + n; Select[ Range[140], Mod[ FromDigits[ Take[ IntegerDigits[ f[n]], n]], 3] != 0 &] %Y A072125 Cf. A007376 & A033307. %K A072125 easy,nonn,base %O A072125 1,2 %A A072125 _Lekraj Beedassy_, Jun 20 2002 %E A072125 Edited by _Robert G. Wilson v_, Jun 21 2002