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A071350
Distinct values of A058250; these terms appear first at subscripts listed in A071349.
3
1, 2, 6, 30, 330, 2310, 53130, 690690, 20030010, 821230410, 13960916970, 739928599410, 27377358178170, 2272320728788110, 97709791337888730, 8696171429072096970, 165227257152369842430, 18670680058217792194590
OFFSET
1,2
LINKS
FORMULA
a(n) = a(n-1) * A112037(n), n >= 2. - David A. Corneth, Apr 27 2021
MATHEMATICA
Prepend[FoldList[Times, DeleteDuplicates[Rest[Flatten[FactorInteger[#][[All, 1]]&/@(Prime[Range[100]]-1)]]]], 1] (* Jamie Morken, Apr 27 2021 after Harvey P. Dale at A112037, May 26 2019 *)
PROG
(PARI) f(n) = my(pr=prod(k=1, n, prime(k))); gcd(pr, eulerphi(pr)); \\ A058250
lista(nn) = Set(vector(nn, k, f(k))); \\ Michel Marcus, Apr 27 2021
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Labos Elemer, May 21 2002
STATUS
approved