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 A106104 #3 Mar 30 2012 17:26:15 %S A106104 47,449,457,467,479,487,499,547,647,947,4447,4457,4547,4549,4567,4597, %T A106104 4649,4657,4679,4759,4787,4789,4799,4877,4889,4957,4967,4969,4987, %U A106104 4999,5449,5477,5479,5647,5749,5849 %N A106104 Primes with minimal digit = 4. %t A106104 Select[Prime[Range[800]], Min[IntegerDigits[ # ]]==4&] %K A106104 nonn,base %O A106104 1,1 %A A106104 _Zak Seidov_, May 07 2005