Numbers k for which 5*k-4, 5*k-2, 5*k+2, and 5*k+4 are primes.

Terms

a(0) =3a(1) =21a(2) =39a(3) =165a(4) =297a(5) =375a(6) =417a(7) =651a(8) =693a(9) =1131a(10) =1887a(11) =2601a(12) =3129a(13) =3147a(14) =3213a(15) =3609a(16) =3783a(17) =3885a(18) =4203a(19) =4455a(20) =5061a(21) =6345a(22) =6969a(23) =8757a(24) =10269a(25) =11067a(26) =12597a(27) =13443a(28) =13899a(29) =14445