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A333986
Greatest prime factor of A007497(n).
1
2, 3, 2, 7, 2, 5, 3, 5, 7, 5, 7, 5, 127, 7, 8191, 5, 127, 13, 31, 127, 127, 89, 31, 17, 127, 31, 3221, 179, 151, 127, 8191, 13, 262657, 11939, 199, 257, 127, 127, 337, 257, 524287, 73, 1093, 547, 137, 241, 1093, 547, 331, 131071, 1093, 599479, 8191, 137, 127, 8191
OFFSET
1,1
LINKS
FORMULA
a(n) = A006530(A007497(n)). - Michel Marcus, Sep 09 2020
MATHEMATICA
f[1] = 2; f[n_] := f[n] = DivisorSigma[1, f[n - 1]]; Table[FactorInteger[f[n]][[-1, 1]], {n, 50}] (* Amiram Eldar, Sep 23 2020 *)
CROSSREFS
Sequence in context: A104565 A144456 A262427 * A349664 A266258 A354486
KEYWORD
nonn
AUTHOR
Richard Peterson, Sep 04 2020
EXTENSIONS
More terms from Michel Marcus, Sep 16 2020
STATUS
approved