A144307 Triangle read by rows: prime numbers p(n) along left edge (n, 1) and p(n - 1) along right edge (n, n), with (n, k) = rad((n - 1, k - 1) + (n - 1, k)) for 1 < k < n when n > 2.

2, 3, 2, 5, 5, 3, 7, 10, 2, 5, 11, 17, 6, 7, 7, 13, 14, 23, 13, 14, 11, 17, 3, 37, 6, 3, 5, 13, 19, 10, 10, 43, 3, 2, 6, 17, 23, 29, 10, 53, 46, 5, 2, 23, 19, 29, 26, 39, 21, 33, 51, 7, 5, 42, 23, 31, 55, 65, 30, 6, 42, 58, 6, 47, 65, 29, 37, 86, 30, 95, 6, 6, 10, 2, 53, 14, 94, 31

Offset

1,1

Comments

Large clusters of twos occur periodically along interior diagonals. The final two in the terms given begins one such cluster.

Links

Table of n, a(n) for n=1..78.

Crossrefs

Cf. A000040, A007947

Sequence in context: A125179 A141821 A144308 * A144310 A330049 A240858

Adjacent sequences: A144304 A144305 A144306 * A144308 A144309 A144310

Keyword

easy,nonn,tabl

Author

Reikku Kulon, Sep 17 2008

Status

approved