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A138139
Triangle read by rows: row n contains n terms and each column lists the prime numbers A000040.
4
2, 2, 2, 2, 3, 2, 2, 3, 3, 2, 2, 3, 5, 3, 2, 2, 3, 5, 5, 3, 2, 2, 3, 5, 7, 5, 3, 2, 2, 3, 5, 7, 7, 5, 3, 2, 2, 3, 5, 7, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 13, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 13, 13, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11
OFFSET
1,1
LINKS
EXAMPLE
Triangle begins:
2
2,2
2,3,2
2,3,3,2
2,3,5,3,2
MAPLE
A138139 := proc(n, k) return ithprime(min(k, n-k+1)): end: seq(seq(A138139(n, k), k=1..n), n=1..13); # Nathaniel Johnston, Apr 30 2011
CROSSREFS
Sequence in context: A033618 A061357 A270966 * A259578 A266547 A127992
KEYWORD
easy,nonn,tabl
AUTHOR
Omar E. Pol, Mar 09 2008, Mar 25 2008
STATUS
approved