Central term of nine successive primes whose average is a prime.

Terms

a(0) =491a(1) =617a(2) =757a(3) =1489a(4) =1787a(5) =2141a(6) =2143a(7) =2269a(8) =3529a(9) =3571a(10) =4723a(11) =5563a(12) =6337a(13) =6451a(14) =6659a(15) =6961a(16) =6991a(17) =7741a(18) =7873a(19) =7907a(20) =8821a(21) =10141a(22) =10267a(23) =10657a(24) =12911a(25) =13399a(26) =14629a(27) =15299a(28) =16189a(29) =16451