Hex (or centered hexagonal) numbers that are prime powers of the form (6n+1)^k.

Terms

a(0) =7a(1) =19a(2) =37a(3) =61a(4) =127a(5) =169a(6) =271a(7) =331a(8) =397a(9) =547a(10) =631a(11) =919a(12) =1657a(13) =1801a(14) =1951a(15) =2269a(16) =2437a(17) =2791a(18) =3169a(19) =3571a(20) =4219a(21) =4447a(22) =5167a(23) =5419a(24) =6211a(25) =7057a(26) =7351a(27) =8269a(28) =9241a(29) =10267