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 A023267 #18 Sep 08 2022 08:44:47 %S A023267 7,11,19,61,97,107,131,181,251,271,397,401,419,467,557,601,677,727, %T A023267 907,929,1129,1297,1439,1481,1609,1699,1747,1901,1931,2027,2029,2099, %U A023267 2221,2267,2357,2377,2557,2617,2879,3001,3019,3121,3259,3371,3407,3457,3527 %N A023267 Primes that remain prime through 2 iterations of function f(x) = 9x + 8. %C A023267 Primes p such that 9*p+8 and 81*p+80 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023267 John Cerkan, <a href="/A023267/b023267.txt">Table of n, a(n) for n = 1..10000</a> %o A023267 (Magma) [n: n in [1..100000] | IsPrime(n) and IsPrime(9*n+8) and IsPrime(81*n+80)] // _Vincenzo Librandi_, Aug 04 2010 %Y A023267 Subsequence of A023235. %K A023267 nonn %O A023267 1,1 %A A023267 _David W. Wilson_