A245784 Numerator of (n/tau(n) + sigma(n)/n).

2, 5, 17, 37, 37, 7, 65, 31, 40, 43, 145, 13, 197, 73, 107, 411, 325, 31, 401, 163, 569, 157, 577, 11, 718, 211, 889, 20, 901, 123, 1025, 701, 427, 343, 1417, 235, 1445, 421, 1745, 29, 1765, 211, 1937, 305, 277, 601, 2305, 443, 2572, 1529, 963, 823, 2917, 323

Offset: 1

Author

Jaroslav Krizek, Aug 15 2014

Keywords

• nonn
• frac

Comments

Numerator of (n/A000005(n) + A000203(n)/n).

See A245785 - denominator of (n/tau(n) + sigma(n)/n).

Examples

			For n = 9; a(9) = numerator(9/tau(9) + sigma(9)/9) = numerator(9/3 + 13/9) = numerator(40/9) = 40.
		

Links

• Jaroslav Krizek, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000005, A000203, A245785, A245786.

Programs

Magma

[Numerator((n/(#[d: d in Divisors(n)]))+(SumOfDivisors(n)/n)): n in [1..1000]]

PARI

for(n=1, 100, s=n/numdiv(n); t=sigma(n)/n; print1(numerator(s+t),", ")) \\ Derek Orr, Aug 15 2014