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A135386 Mersenne composites A065341 with 4 or more prime factors. 1
10384593717069655257060992658440191, 2854495385411919762116571938898990272765493247, 182687704666362864775460604089535377456991567871 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MAPLE
A135386 := proc(n) local i;
i := 2^(ithprime(n))-1:
if (nops(numtheory[factorset](i)) > 3) then
RETURN (i)
fi: end: seq(A135386(n), n=1..37); # Jani Melik, Feb 09 2011
MATHEMATICA
k = {}; Do[If[ ! PrimeQ[2^Prime[n] - 1], c = FactorInteger[2^Prime[n] - 1]; d = Length[c]; If[d >3, AppendTo[k, 2^Prime[n] - 1]]], {n, 1, 40}]; k
CROSSREFS
Subsequence of A065341.
Sequence in context: A083103 A115532 A074194 * A095462 A115543 A219323
KEYWORD
nonn,bref
AUTHOR
Artur Jasinski, Dec 09 2007
STATUS
approved

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Last modified April 12 20:38 EDT 2024. Contains 371639 sequences. (Running on oeis4.)