a(n)=2*q-prime(n), where q is the prime < p(n) for which (prime(n) mod q) is maximal.

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =1a(5) =5a(6) =3a(7) =3a(8) =5a(9) =3a(10) =1a(11) =5a(12) =3a(13) =11a(14) =5a(15) =3a(16) =1a(17) =7a(18) =3a(19) =1a(20) =3a(21) =3a(22) =5a(23) =9a(24) =5a(25) =3a(26) =11a(27) =9a(28) =5a(29) =7