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A305828 The n-th number m such that a nontrivial prime(n)-th root of unity modulo m exists. 2
8, 9, 25, 58, 89, 158, 307, 571, 282, 466, 1303, 1043, 913, 1384, 1977, 1486, 3308, 2936, 3497, 3983, 2930, 4426, 2338, 3401, 4668, 6070, 6186, 6430, 10910, 4994, 9671, 4997, 9053, 10583, 13123, 10874, 22611, 14366, 30066, 8328, 10031, 15206, 11873, 17006 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For n > 1 the n-th number m such that phi(m) is divisible by the n-th prime.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..740

FORMULA

a(n) = A277915(n,n).

CROSSREFS

Main diagonal of A277915.

Cf. A000010, A000040.

Sequence in context: A173336 A277925 A173745 * A322652 A041134 A108219

Adjacent sequences:  A305825 A305826 A305827 * A305829 A305830 A305831

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jun 10 2018

STATUS

approved

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Last modified November 17 08:39 EST 2019. Contains 329217 sequences. (Running on oeis4.)