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 A106155 #15 Jun 10 2023 03:09:12 %S A106155 3,4,5,6,7,10,12,13,19,26,28,41,66,73,76,78,85,371,437,513,661,726, %T A106155 924,1063,1331,1380,1422,1602,1947,1963,3091,3295,3401 %N A106155 Numbers k > 2 such that prime(k)# + (prime(k+1))^2 or prime(k+1)# - (prime(k+2))^2 is prime or both are primes. %e A106155 2*3*5 + 7*7 = 79 prime as 2*3*5*7 - 11*11 = 89 prime so a(1)=3. %e A106155 2*3*5*7 + 11*11 = 331 prime as 2*3*5*7*11 -13*13 = 2141 prime so a(2)=4. %e A106155 2*3*5*7*11 + 13*13 = 2479 = 37*67 composite. %e A106155 2*3*5*7*11*13 - 17*17 = 29471 prime so a(3)=5. %Y A106155 Cf. A002110, A038767. %K A106155 more,nonn %O A106155 1,1 %A A106155 _Pierre CAMI_, May 08 2005 %E A106155 a(20)-a(30) from _Donovan Johnson_, Apr 27 2008 %E A106155 a(31)-a(33) from _Michael S. Branicky_, Jun 09 2023