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 A023280 #20 Sep 08 2022 08:44:47 %S A023280 3,19,47,149,199,233,353,563,607,709,919,1013,1361,1367,1697,1801, %T A023280 1871,2137,2203,2819,2879,2917,3041,3229,3449,3701,3943,4093,4111, %U A023280 4177,4567,4973,5519,5689,5987,6053,6359,6421,6841,7019,7283,8647,8951,9109,9719 %N A023280 Primes that remain prime through 3 iterations of function f(x) = 3x + 10. %C A023280 Primes p such that 3*p+10, 9*p+40 and 27*p+130 are also primes. - _Vincenzo Librandi_, Aug 04 2010 %H A023280 Harvey P. Dale, <a href="/A023280/b023280.txt">Table of n, a(n) for n = 1..1000</a> %t A023280 Select[Prime[Range[1200]],AllTrue[Rest[NestList[3#+10&,#,3]],PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* _Harvey P. Dale_, Mar 22 2015 *) %o A023280 (Magma) [n: n in [1..150000] | IsPrime(n) and IsPrime(3*n+10) and IsPrime(9*n+40) and IsPrime(27*n+130)] // _Vincenzo Librandi_, Aug 04 2010 %K A023280 nonn %O A023280 1,1 %A A023280 _David W. Wilson_