A392359 Denominators of the reduced fractions of the ratios of the number of primes less than n over n.

1, 2, 3, 2, 5, 2, 7, 2, 9, 5, 11, 12, 13, 7, 5, 8, 17, 18, 19, 5, 21, 11, 23, 8, 25, 26, 3, 28, 29, 3, 31, 32, 3, 34, 35, 36, 37, 19, 13, 10, 41, 42, 43, 22, 45, 23, 47, 16, 49, 10, 17, 52, 53, 27, 55, 7, 57, 29, 59, 60, 61, 31, 7, 32, 65, 11, 67, 68, 69, 70, 71, 18, 73, 74, 25

Offset

1,2

Links

Table of n, a(n) for n=1..75.

Formula

a(n) = denominator(pi(n)/n).

Mathematica

a[n_]:=Denominator[PrimePi[n]/n]; Array[a, 75]

Crossrefs

Cf. A000720, A102613 (numerators), A102614.

Sequence in context: A007388 A348846 A057815 * A007387 A105222 A280503

Adjacent sequences: A392356 A392357 A392358 * A392360 A392361 A392362

Keyword

nonn,frac

Author

Stefano Spezia, Jan 08 2026

Status

approved