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A123711
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Indices n such that A123709(n) = 8 = number of nonzero terms in row n of triangle A123706.
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4
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12, 18, 20, 24, 28, 36, 40, 44, 45, 48, 50, 52, 54, 56, 63, 68, 72, 75, 76, 80, 88, 92, 96, 98, 99, 100, 104, 108, 112, 116, 117, 124, 135, 136, 144, 147, 148, 152, 153, 160, 162, 164, 171, 172, 175, 176, 184, 188, 189, 192, 196, 200, 207, 208, 212, 216, 224, 225
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Triangle A123706 is the matrix inverse of triangle A010766, where A010766(n,k) = [n/k].
It appears that this equals A200511, numbers of the form p^k q^m with k,m >= 1, k+m > 2 and p, q prime. - M. F. Hasler, Feb 12 2012
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PROG
| (PARI)
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CROSSREFS
| Cf. A123706, A123709, A123710, A123712; A010766.
Sequence in context: A036456 A102467 A126706 * A200511 A059404 A177425
Adjacent sequences: A123708 A123709 A123710 * A123712 A123713 A123714
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KEYWORD
| nonn,changed
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Oct 09 2006
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