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A153515 Terms of A122782 which are not Carmichael numbers A002997. 4
1, 4, 10, 15, 20, 65, 124, 190, 217, 310, 435, 781, 1541, 1891, 3565, 3820, 4123, 4495, 5461, 5611, 5662, 5731, 6735, 7449, 7813, 8029, 8290, 9881, 11041, 11476, 12801, 13021, 13333, 13981, 14981, 15751, 16297, 17767, 20345, 20710, 21361, 22791 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Are there entries in this sequence which are also in A153513 ?

Yes. This subsequence starts 721801, 873181, 4504501, 8646121, 9006401, 9863461, 10403641, 10680265,... (similar to A153580). - R. J. Mathar, Mar 30 2011

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[10^4], !PrimeQ[#] && PowerMod[5, #, # ] == Mod[5, #] && Mod[#, CarmichaelLambda[#]] != 1 &] (* Amiram Eldar, Sep 19 2019 *)

CROSSREFS

Cf. A002997, A122780, A153508, A153513.

Sequence in context: A310466 A310467 A122782 * A310468 A310469 A310470

Adjacent sequences: A153512 A153513 A153514 * A153516 A153517 A153518

KEYWORD

nonn

AUTHOR

Artur Jasinski, Dec 28 2008

STATUS

approved

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Last modified December 4 20:32 EST 2022. Contains 358570 sequences. (Running on oeis4.)