A144310 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)), multiplied by two if four divides (n - 1, k - 1) + (n - 1, k), for 1 < k < n when n > 2.

2, 3, 2, 5, 5, 3, 7, 10, 4, 5, 11, 17, 14, 3, 7, 13, 28, 31, 17, 10, 11, 17, 41, 59, 12, 3, 21, 13, 19, 58, 20, 71, 15, 12, 34, 17, 23, 77, 78, 91, 86, 3, 46, 51, 19, 29, 20, 155, 13, 177, 89, 7, 97, 70, 23, 31, 7, 35, 84, 190, 266, 12, 52, 167, 93, 29

Offset

1,1

Comments

Among the initial terms, 12 occurs most frequently. 3 and 17 are also common.

Links

Table of n, a(n) for n=1..66.

Example

(7, 2) = 41
(7, 3) = 59
41 + 59 = 100
rad(100) = A007947(100) = 10
Four divides 100, so (8, 3) = 20.

Crossrefs

Cf. A000040, A007947, A144100

Sequence in context: A141821 A144308 A144307 * A330049 A240858 A035361

Adjacent sequences: A144307 A144308 A144309 * A144311 A144312 A144313

Keyword

easy,nonn,tabl

Author

Reikku Kulon, Sep 17 2008

Status

approved