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1, 4, 8, 16, 30, 36, 60, 72, 120, 144, 192, 216, 256, 360, 420, 480, 576, 768, 864, 960, 1080, 1260, 1440, 1680, 1800, 2048, 2304, 2520, 2880, 3360, 3600, 4096, 4608, 5040, 5400, 6144, 6480, 6912, 7560, 7776, 8640, 9240, 10368, 11520, 12600, 13440, 13860
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A025487: least integer of each prime signature; also products of primorial numbers A002110. - Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 14 2005
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MATHEMATICA
| PrimeExponents[n_] := Last /@ FactorInteger@n; lpe = {}; ln = {1}; Do[ pe = Sort@PrimeExponents@n; If[FreeQ[lpe, pe], AppendTo[lpe, pe]; AppendTo[ln, n]], {n, 15000}]; ln[[2# - 1]] & /@ Range@(Length@ln/2) (* Robert G. Wilson v *)
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CROSSREFS
| Cf. A099993.
Sequence in context: A009861 A030119 A034451 * A053163 A125626 A141031
Adjacent sequences: A099989 A099990 A099991 * A099993 A099994 A099995
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 20 2004
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 14 2005
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