(p^2 - 3)/2 for odd primes p.

Terms

a(0) =3a(1) =11a(2) =23a(3) =59a(4) =83a(5) =143a(6) =179a(7) =263a(8) =419a(9) =479a(10) =683a(11) =839a(12) =923a(13) =1103a(14) =1403a(15) =1739a(16) =1859a(17) =2243a(18) =2519a(19) =2663a(20) =3119a(21) =3443a(22) =3959a(23) =4703a(24) =5099a(25) =5303a(26) =5723a(27) =5939a(28) =6383a(29) =8063