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, 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

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