Numbers k such that if P = 10*k^2+1, then P, P+6, P+12 and P+18 are all primes.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =20a(5) =83a(6) =110a(7) =128a(8) =141a(9) =216a(10) =223a(11) =334a(12) =506a(13) =810a(14) =825a(15) =867a(16) =1086a(17) =1171a(18) =1861a(19) =2178a(20) =2295a(21) =2680a(22) =2911a(23) =3803a(24) =4884a(25) =7737a(26) =8010a(27) =8457a(28) =8520a(29) =9858