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A106317 Numbers n such that the remainder of the harmonic residue of n when divided by n is n-1. 3
1, 2, 3, 5, 7, 11, 13, 17, 19, 21, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..48.

FORMULA

It appears that n is in the sequence iff n is prime or n is in {1, 21, 822857} (Verified to 3.1*10^6). It is true that if n is the product of two distinct primes, then n=21. - George J. Schaeffer (gschaeff(AT)andrew.cmu.edu), Apr 30 2005, R. J. Mathar, Jan 25 2017

CROSSREFS

Cf. A106315, A106316.

Sequence in context: A117289 A328513 A318719 * A246281 A152242 A166504

Adjacent sequences:  A106314 A106315 A106316 * A106318 A106319 A106320

KEYWORD

nonn

AUTHOR

George J. Schaeffer (gschaeff(AT)andrew.cmu.edu), Apr 29 2005

STATUS

approved

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Last modified December 15 17:03 EST 2019. Contains 330000 sequences. (Running on oeis4.)