

A154792


Triangle read by rows in which row n lists the pair of noncomposite numbers that are equidistant from and nearest to n, with 0's inserted, as shown below in the example.


0



0, 1, 3, 1, 0, 5, 0, 3, 5, 0, 0, 3, 0, 7, 0, 0, 0, 5, 7, 0, 0, 0, 3, 0, 0, 0, 11, 0, 0, 0, 5, 0, 0, 11, 0, 0, 0, 0, 0, 7, 0, 11, 0, 0, 0, 0, 0, 0, 7, 0, 0, 13, 0, 0, 0
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OFFSET

1,3


LINKS

Table of n, a(n) for n=1..55.


EXAMPLE

Triangle begins:
n ........ Pair
1 ..........0
2 ........ 1,3
3 ....... 1,0,5
4 ...... 0,3,5,0
5 ..... 0,3,0,7,0
6 .... 0,0,5,7,0,0


CROSSREFS

Cf. A008578, A154720, A154721, A154722, A154723, A154791.
Sequence in context: A143468 A133728 A127627 * A185911 A187954 A119302
Adjacent sequences: A154789 A154790 A154791 * A154793 A154794 A154795


KEYWORD

more,nonn,tabl


AUTHOR

Omar E. Pol, Jan 25 2009


STATUS

approved



