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A112303
Permutation of primes generated by 3-rowed array shown below.
0
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)
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
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Oct 17 2006, Nov 08 2006
STATUS
approved