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A138139
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Triangle read by rows: row n contains n terms and each column lists the prime numbers A000040.
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4
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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
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..10000
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EXAMPLE
| Triangle begins:
..... 2
.... 2,2
... 2,3,2
.. 2,3,3,2
. 2,3,5,3,2
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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
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CROSSREFS
| Cf. A000040, A003983.
Sequence in context: A047931 A033618 A061357 * A127992 A169989 A067595
Adjacent sequences: A138136 A138137 A138138 * A138140 A138141 A138142
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Mar 09 2008, Mar 25 2008
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