A256103 a(n) = gcd(A001008(m(n)), m(n)), with m(n) = A256102(n), n >= 1.

5, 7, 11, 11, 13, 17, 19, 23, 29, 31, 43, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 11, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223

Offset

1,1

Comments

See A256102. The entry a(n) gives the quotient of the numerator of the harmonic sum of the first A256102(n) positive integers and the denominator of the harmonic mean of the same numbers. For each positive integer values m not from A256102 this quotient is 1.

Links

Table of n, a(n) for n=1..49.

Formula

a(n) = gcd(A001008(m(n)), m(n)), with m(n) = A256102(n), n >= 1.

a(n) = A001008(m(n))/A175441(m(n)), with m(n) = A256103(n), n >= 1.

Example

n = 1: gcd(A001008(20), 20) = gcd(55835135, 20) = 5. A001008(20)/A175441(20) = 55835135/11167027 = 5.
Because 19 is not from A256102 one has A001008(19) = A175441(19) = 275295799.

Crossrefs

Cf. A256102, A002805, A001008, A175441.

Sequence in context: A107257 A275515 A098806 * A374524 A275645 A122278

Adjacent sequences: A256100 A256101 A256102 * A256104 A256105 A256106

Keyword

nonn,easy

Author

Wolfdieter Lang, Apr 16 2015

Status

approved