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 A217264 #10 Oct 02 2012 08:31:34 %S A217264 63,549,657,833,1127,2009,3311,3971,4149,5043,5409,5491,10539,11493, %T A217264 13059,13941,14517,16839,17591,17991,18621,19133,20259,20781,21119, %U A217264 21249,21537,22023,23471,24183,25529,27181,30897,31653,32153,33271,33309,34227,35443 %N A217264 Numbers with 3 or more prime factors (with multiplicity) such that every concatenation of their prime factors is prime. %e A217264 63 is 3*3*7. 337, 373 and 733 are all prime, so 63 is in the sequence. %Y A217264 Cf. A217263, A217265, A180679, A181559. %K A217264 nonn,base %O A217264 1,1 %A A217264 _Dmitri Kamenetsky_, Sep 29 2012