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 A217658 #6 Jun 02 2015 08:31:54 %S A217658 13,19,3,73,523,6581,10753,231643,387679,43103,255259,55457,28751773, %T A217658 328934789,278689963,784284211,4440915607,8340839629,30651695947 %N A217658 In A217564, prime(i), where i is the index of the start of the first exactly-n terms between successive zeros. %e A217658 The first exactly-4 terms between successive zeros in A217564 are '1,1,1,1' beginning at index 21, so a(4) = prime(21) = 73. %e A217658 The first exactly-5 terms between successive zeros in A217564 are '2,1,1,1,1' beginning at index 99, so a(5) = prime(99) = 523. %Y A217658 Cf. A217564. %K A217658 nonn %O A217658 1,1 %A A217658 _Hans Havermann_, Oct 09 2012