Dear seqfans, A004767 4*n+3: 3, 7, 11, 15, 19, 23, 27, 31, 35, 39, ... It is conjectured that A004767(n) either is a prime or is the average of two primes which are terms of this sequence. Joerg says this sequence is hardly about primes. Could I add this conjecture to A004767? Yours mike,