OFFSET
1,1
COMMENTS
Most Lucas-Carmichael numbers are congruent to 3 (mod 4). Of the 9967 numbers less than 10^12 only 198 are congruent to 1 (mod 4).
Analogous to A185321 - Carmichael numbers that are congruent to 3 (mod 4).
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..198 (terms below 10^12)
MATHEMATICA
a=Select[Range[2, 10^6], !PrimeQ[#] && Union[Transpose[FactorInteger[#]][[2]]] == {1} && Union[Mod[# + 1, Transpose[FactorInteger[#]][[1]] + 1]]=={0} &] ; Select[a, Mod[#, 4]==1 &] (* after Richard Pinch and Jeffrey Shallit at A006972 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Sep 07 2017
STATUS
approved