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A338190 Integers m such that A337454(m) = tau(m), the number of divisors of n. 2
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 22, 23, 25, 26, 27, 29, 30, 31, 32, 34, 36, 37, 38, 39, 41, 43, 45, 46, 47, 49, 50, 51, 53, 54, 58, 59, 61, 62, 64, 67, 71, 73, 74, 75, 78, 79, 81, 82, 83, 85, 86, 87, 89, 90, 91, 94, 97, 98, 99, 101, 102 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..69.

PROG

(PARI) f(n) = sumdiv(n, d, n % (sum(m=0, n-1, Mod(m, n)^d == m)/sum(m=0, n-1, -Mod(m, n)^d == m)) == 0); \\ A337454

isok(n) = f(n) == numdiv(n);

CROSSREFS

Cf. A000005, A337454, A338189.

Sequence in context: A325397 A289812 A206551 * A247762 A343268 A107909

Adjacent sequences:  A338187 A338188 A338189 * A338191 A338192 A338193

KEYWORD

nonn

AUTHOR

Michel Marcus, Oct 15 2020

STATUS

approved

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Last modified April 14 18:11 EDT 2021. Contains 342950 sequences. (Running on oeis4.)