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A180334 a(n) is the least number such that there are n semiprimes pq such that (p+1)(q+1) = a(n) for each semiprime. 1
9, 24, 72, 144, 576, 1080, 2160, 1440, 8640, 20160, 15120, 40320, 70560, 60480, 191520, 166320, 211680, 514080, 277200, 982800, 907200, 1663200, 831600, 720720, 2162160, 4989600, 2494800, 8648640, 5266800, 8845200, 8316000, 15724800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A180333 for the semiprimes for each n.

LINKS

Table of n, a(n) for n=1..32.

CROSSREFS

Sequence in context: A038626 A195970 A223372 * A223290 A121089 A050282

Adjacent sequences:  A180331 A180332 A180333 * A180335 A180336 A180337

KEYWORD

nonn

AUTHOR

Zak Seidov and T. D. Noe, Sep 08 2010

STATUS

approved

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Last modified April 6 12:19 EDT 2020. Contains 333273 sequences. (Running on oeis4.)