Numbers k such that 2k+1, 4k+1, 6k+1, 8k+1, 10k+1 and 12k+1 are primes.

Terms

a(0) =12705a(1) =13020a(2) =105525a(3) =256410a(4) =966840a(5) =1707510a(6) =1944495a(7) =2310000a(8) =2478630a(9) =3132675a(10) =3836070a(11) =3976770a(12) =4112430a(13) =4532325a(14) =5499585a(15) =5920005a(16) =6610485a(17) =7390845a(18) =8552250a(19) =10739505a(20) =11120340a(21) =12231450a(22) =12338130a(23) =13243230a(24) =16467255