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

1,1

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)

Links

Table of n, a(n) for n=1..54.

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.

Crossrefs

Cf. A115302.

Sequence in context: A362359 A076992 A138751 * A336854 A209666 A089124

Adjacent sequences: A112300 A112301 A112302 * A112304 A112305 A112306

Keyword

easy,nonn

Author

Giovanni Teofilatto, Oct 17 2006, Nov 08 2006

Status

approved