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 A226768 #6 Jan 19 2019 04:15:43 %S A226768 2,89,199,4679,1499,24593,118801,318569,1055741,2253311,3695513, %T A226768 4559983,22790969,29625383,85780433,108547289,1092631789,520956851, %U A226768 23522240041,11229387053,50466176303,325923513479,57958489439,537724352057,932937059897,1970378236613,12522644028841 %N A226768 Least prime in a string of exactly n consecutive primes all differing by 3-almost primes (A014612). %C A226768 a(28) > 4*10^13. %e A226768 a(3) = 199 since (199, 211, 223) is the first triple (which cannot be extended to a quadruplet) of consecutive primes whose first differences are 3-almost primes, 211-199 = 223-211 = 2^2*3. %Y A226768 Cf. A220697, A226769, A226840. %K A226768 nonn %O A226768 1,1 %A A226768 _Giovanni Resta_, Jun 17 2013