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A216928 Least Lucas-Carmichael number with n prime factors. 1
399, 8855, 588455, 139501439, 3512071871, 199195047359, 14563696180319, 989565001538399, 20576473996736735, 4049149795181043839, 409810997884396741919, 46852073639840281125599 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

Is this sequence infinite? - Charles R Greathouse IV, Sep 23 2012

a(15) <= 6414735508880546179805759. a(16) <= 466807799396932243821123839. - Donovan Johnson, Sep 26 2012

LINKS

Table of n, a(n) for n=3..14.

Ed Copeland and Brady Haran, Something special about 399, Numberphile video (2015)

CROSSREFS

Cf. A006972 (Lucas-Carmichael numbers).

Sequence in context: A166915 A110885 A249408 * A283384 A140892 A115470

Adjacent sequences:  A216925 A216926 A216927 * A216929 A216930 A216931

KEYWORD

nonn,more

AUTHOR

Tim Johannes Ohrtmann, Sep 20 2012

EXTENSIONS

a(7)-a(12) from Donovan Johnson, Sep 22 2012

a(13)-a(14) from Donovan Johnson, Sep 26 2012

STATUS

approved

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Last modified October 19 15:05 EDT 2021. Contains 348091 sequences. (Running on oeis4.)