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1, 2, 1, 2, 0, 1, 3, 3, 0, 1, 2, 0, 0, 0, 1, 4, 4, 4, 0, 0, 1, 2, 0, 0, 0, 0, 0, 1, 4, 7, 0, 5, 0, 0, 0, 1, 3, 0, 7, 0, 0, 0, 0, 0, 1, 4, 6, 0, 0, 6, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 12, 14, 11, 0, 7, 0, 0, 0, 0, 0, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Left border = d(n), A000005
Row sums = A156838: (1, 3, 3, 7, 3, 13, 3, 17, 11,...).
Row sums = 3 iff n-th row is prime.
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FORMULA
| Triangle read by rows, A051731 * A156348 = inverse Mobius transform of A156348
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EXAMPLE
| First few rows of the triangle =
1;
2, 1;
2, 0, 1;
3, 3, 0, 1;
2, 0, 0, 0, 1;
4, 4, 4, 0, 0, 1;
2, 0, 0, 0, 0, 0, 1;
4, 7, 0, 5, 0, 0, 0, 1;
3, 0, 7, 0, 0, 0, 0, 0, 1;
4, 6, 0, 0, 6, 0, 0, 0, 0, 1;
2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
6, 12, 14, 11, 0, 7, 0, 0, 0, 0, 0, 1;
2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
4, 8, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 1;
...
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CROSSREFS
| Cf. A156348, A051731, A000005, A156838
Sequence in context: A127170 A143335 A099505 * A129559 A129680 A118231
Adjacent sequences: A156834 A156835 A156836 * A156838 A156839 A156840
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson & Mats Granvik (qntmpkt(AT)yahoo.com), Feb 16 2009
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