a(n) = p^2 + p + 1 where p runs through the primes.

Terms

a(0) =7a(1) =13a(2) =31a(3) =57a(4) =133a(5) =183a(6) =307a(7) =381a(8) =553a(9) =871a(10) =993a(11) =1407a(12) =1723a(13) =1893a(14) =2257a(15) =2863a(16) =3541a(17) =3783a(18) =4557a(19) =5113a(20) =5403a(21) =6321a(22) =6973a(23) =8011a(24) =9507a(25) =10303a(26) =10713a(27) =11557a(28) =11991a(29) =12883