A112303 Permutation of primes generated by 3-rowed array shown below.

2, 7, 3, 17, 11, 5, 29, 19, 13, 41, 31, 23, 53, 43, 37, 67, 59, 47, 79, 71, 61, 97, 83, 73, 107, 101, 89, 127, 109, 103, 139, 139, 131, 113, 157, 149, 137, 173, 163, 151, 191, 179, 167, 193, 181, 227, 211, 197, 239, 229, 223, 257, 263, 251

Offset: 1

Author

Giovanni Teofilatto, Oct 17 2006, Nov 08 2006

Keywords

• easy
• nonn

Comments

2 7 17 29 41 53 67 79...(A031377)

3 11 19 31 43 59 71 83...(A031369)

5 13 23 37 47 61 73 89...(A031336)

Crossrefs

Cf. A115302.

Formula

a(n) = A000040(a(p+3q) = a(p)+3q) with p and q positive integers.

a(n) = PrimePi(a(p+3q) = a(p)+3q) with p and q positive integers.