OFFSET
1,1
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 1..10000
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
KEYWORD
AUTHOR
Omar E. Pol, Mar 09 2008, Mar 25 2008
STATUS
approved