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 A158245 #4 Mar 30 2012 17:22:54 %S A158245 11,20,39,49,133,247,543,1218,1651,1729,2289,3097,4171,4503,6231,7303, %T A158245 7540,7563,8773,9139,12439,16627,16761,17157,20280,22021,22393,37051, %U A158245 37209,37387,45201,47257,51961,65379,66211,69601,100191,103861,105339 %N A158245 Primitive numbers in A158235. %C A158245 The primitive terms in A158235 are the ones for which the repdigit is squarefree. Hence n^2 = d*(b^k-1)/(b-1) with d squarefree and d<b<n. %e A158245 105339^2 = 333 in base 60817. %K A158245 nonn %O A158245 1,1 %A A158245 _T. D. Noe_, Mar 14 2009