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A095990
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Numbers with ordered prime signature (1,2).
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5
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18, 50, 75, 98, 147, 242, 245, 338, 363, 507, 578, 605, 722, 845, 847, 867, 1058, 1083, 1183, 1445, 1587, 1682, 1805, 1859, 1922, 2023, 2523, 2527, 2645, 2738, 2883, 3179, 3362, 3698, 3703, 3757, 3971, 4107, 4205, 4418, 4693, 4805, 5043, 5547, 5618, 5819
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers of the form p*q^2 where p and q are primes with p < q.
A054753 contains natural numbers with ordered prime signatures (2,1) and (1,2).
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LINKS
| OEIS Wiki, Ordered prime signatures
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EXAMPLE
| 18 = 2*3*3, 50 = 2*5*5, 75 = 3*5*5, 98 = 2*7*7, 147 = 3*7*7, ...
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MATHEMATICA
| Take[ Sort[ Flatten[ Table[ Prime[p]*Prime[q]^2, {q, 2, 16}, {p, q - 1}]]], 46] (from Robert G. Wilson v Jul 23 2004)
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CROSSREFS
| Subsequence of A071365.
Cf. A054753, A095904, A096156.
Sequence in context: A089219 A102835 * A102836 A180292 A143928 A074173
Adjacent sequences: A095987 A095988 A095989 * A095991 A095992 A095993
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KEYWORD
| easy,nonn
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AUTHOR
| Alford Arnold (Alford1940(AT)aol.com), Jul 18 2004
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EXTENSIONS
| Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 23 2004
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