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A292571 Lucas-Carmichael numbers whose Dedekind psi value is a square. 3
935, 31535, 76751, 1707839, 3106799, 11141999, 24685199, 43383167, 83618639, 151524071, 161841239, 189099039, 212133599, 213884999, 219155615, 233743319, 241485839, 271038599, 287432495, 338340239, 353107799, 624840479, 660423455, 945236159, 1171355471 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..241 (terms below 10^12)
EXAMPLE
psi(935) = 36^2.
MATHEMATICA
psi[n_] := If[n < 1, 0, n*Sum[MoebiusMu[d]^2/d, {d, Divisors@n}]]; s = Import["b006972.txt", "Data"][[All, -1]]; Select[s, IntegerQ@Sqrt[psi@#] &]
CROSSREFS
Intersection of A006972 and A291167.
Sequence in context: A171348 A232380 A366867 * A029570 A278186 A120810
KEYWORD
nonn
AUTHOR
Amiram Eldar, Sep 19 2017
STATUS
approved

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Last modified February 22 06:21 EST 2024. Contains 370240 sequences. (Running on oeis4.)