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 A218865 #20 May 11 2013 19:10:54 %S A218865 440738966073,464881210073,645462662449,914549532721,932537185321, %T A218865 936083045673,1043710445721,1091100709673,1225660528209,1349165568945, %U A218865 1602377996921,1682159750473,1714275593649,1730241245545,1756186304521,1872671302049,1956516794721,1987087485225 %N A218865 First of a run of 7 consecutive numbers with same prime signature. %C A218865 a(1) = A034173(7) = A218455(443) = A218455(444)-1. %C A218865 a(19) > 2*10^12. - _Donovan Johnson_, May 11 2013 %e A218865 The 7 consecutive numbers from 645462662449 to 645462662455 all have a prime signature of 2,1,1,1. %Y A218865 Cf. A034173, A034174, A052213, A052214, A175590, A218448, A218455. %K A218865 nonn %O A218865 1,1 %A A218865 _Donovan Johnson_, Nov 08 2012 %E A218865 a(7)-a(18) from _Donovan Johnson_, May 11 2013