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 A160594 #12 Mar 02 2021 03:19:45 %S A160594 6,12,18,21,25,29,37,42,44,50,53,59,65,68,70,74,78,80,82,84,88,100, %T A160594 106,110,112,121,122,127,130,134,136,145,147,151,159,168,169,172,174, %U A160594 180,183,187,189,191,197,198,203,204,211,216,221,226,231,237,244,251,254 %N A160594 Indices of primes congruent to 1 modulo 12. %C A160594 The asymptotic density of this sequence is 1/4 (by Dirichlet's theorem). - _Amiram Eldar_, Mar 02 2021 %H A160594 Harvey P. Dale, <a href="/A160594/b160594.txt">Table of n, a(n) for n = 1..1000</a> %F A160594 a(n) = A000720(A068228(n)). %e A160594 a(1) = 6 since the 6th prime, A000040(6) = 13, is the first one to be equal to 1 (mod 12). %e A160594 a(2) = 12 since the 12th prime, A000040(12) = 37, is the second one to be equal to 1 (mod 12). %t A160594 PrimePi/@Select[Range[1,1701,12],PrimeQ] (* _Harvey P. Dale_, Nov 28 2011 *) %o A160594 (PARI) for( n=1,999, prime(n)%12==1 & print1(n",")) %Y A160594 A116614 lists the even terms of this sequence, divided by 2. %Y A160594 Cf. A000720, A068228. %K A160594 nonn %O A160594 1,1 %A A160594 _M. F. Hasler_, May 22 2009