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Search: id:A110885
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| A110885 |
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Lucas-Carmichael numbers n that are not == 11 mod 12. There are 101 Lucas-Carmichael numbers out to 2*m+1, m=2*10^6 and all but the above 9 are 11 mod 12. |
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+0
1
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| 399, 5719, 20705, 80189, 120581, 162687, 482143, 663679, 1162349
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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5719=7*19*43=7 mod 12.
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MAPLE
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with(numtheory); LC:=[]: for z from 1 to 1 do for m from 1 to 2000000 do n:=2*m+1; if not(isprime(n)) and issqrfree(n) then PF:=factorset(n); lcb:=true; for x in PF do if (n+1) mod (x+1) > 0 then lcb:=false fi od; if lcb then LC:=[op(LC), n]; fi; fi; #not od; #m od; #z select(proc(z) not(z mod 12 = 11) end, LC);
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CROSSREFS
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Cf. A006972.
Sequence in context: A006972 A065767 A166915 this_sequence A140892 A115470 A061042
Adjacent sequences: A110882 A110883 A110884 this_sequence A110886 A110887 A110888
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KEYWORD
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nonn
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AUTHOR
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Walter A. Kehowski (wkehowski(AT)cox.net), Sep 19 2005
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