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A299213 Lucas-Carmichael numbers whose prime factors do not divide any smaller Lucas-Carmichael number. 0
399, 935, 565861139, 5778659039, 22824172799, 49569379679, 221511111527, 572531110799, 745012846679 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Also numbers whose number of occurrence in A253597 equals the number of their prime factors.
All known terms have only 3 prime factors. Does any term with more than 3 prime factors exist?
LINKS
EXAMPLE
565861139 = 193*1163*2521 and no smaller Lucas-Carmichael number is divisible by 193, 1163 or 2521.
PROG
(PARI) a=readvec("b006972.txt"); print1(399); for(b=2, 10000, e=true; f=factor(a[b]); for(d=1, #f[, 1], for(c=1, b-1, if(a[c]%f[d, 1]==0, e=false))); if(e==true, print1(", ", a[b])))
CROSSREFS
Sequence in context: A006972 A216925 A292573 * A206536 A292538 A369246
KEYWORD
nonn,more
AUTHOR
STATUS
approved

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Last modified May 27 12:27 EDT 2024. Contains 372858 sequences. (Running on oeis4.)