A217842 - OEIS

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A217842

Product of the numbers p such that phi(p) = n, where phi is Euler's totient function.

2, 72, 1, 4800, 1, 15876, 1, 3456000, 1, 242, 1, 300500928, 1, 1, 1, 2130739200, 1, 1052676, 1, 119790000, 1, 1058, 1, 531598161669120000, 1, 1, 1, 1682, 1, 1922, 1, 20864198246400, 1, 1, 1, 1159208596538496, 1, 1, 1, 265804426800000000, 1, 17757796, 1

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OFFSET

1,1

COMMENTS

It appears that all terms greater than 1 are distinct. This is true for all n <= 10^6.

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

D. Bressoud, CNT.m Computational Number Theory Mathematica package.

MATHEMATICA

Needs["CNT`"]; Table[Times @@ PhiInverse[n], {n, 100}]

CROSSREFS

Cf. A002181 (smallest inverse), A006511 (largest inverse), A215240 (sum of inverses).

Cf. A032447 (inverse of phi).

Sequence in context: A055030 A361688 A185120 * A053318 A272757 A187707

Adjacent sequences: A217839 A217840 A217841 * A217843 A217844 A217845

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 12 2012

STATUS

approved