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 A111094 #27 Oct 28 2024 18:54:32 %S A111094 1,2,4,6,7,9,10,11,15,17,21,22,24,27,29,30,32,34,35,41,42,45,46,49,51, %T A111094 52,55,56,59,62,64,65,71,72,79,81,85,86,87,90,92,94,97,99,100,104,111, %U A111094 112,114,116,119,120,121,125,126,127,130,132,137,139,140,141,142,144 %N A111094 Numbers k such that 18*k + 1 is prime. %C A111094 a(n) = A024906(n)/2. - _Zak Seidov_, Feb 02 2010 %H A111094 Daniel Starodubtsev, <a href="/A111094/b111094.txt">Table of n, a(n) for n = 1..10000</a> %e A111094 If k=99 then 18*k + 1 = 1783 (prime). %t A111094 Select[Range[200],PrimeQ[18#+1]&] (* _Harvey P. Dale_, Mar 14 2011 *) %o A111094 (Magma) [ n: n in [0..1500] | IsPrime(18*n + 1) ]; // _Vincenzo Librandi_, Jan 31 2011 %o A111094 (PARI) is(n)=isprime(18*n+1) \\ _Charles R Greathouse IV_, Feb 20 2017 %Y A111094 Cf. A024906. %K A111094 nonn,easy %O A111094 1,2 %A A111094 _Parthasarathy Nambi_, Oct 20 2005 %E A111094 More terms from _Zak Seidov_, Feb 02 2010