The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A245784 Numerator of (n/tau(n) + sigma(n)/n). 3
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numerator of (n/A000005(n) + A000203(n)/n). See A245785 - denominator of (n/tau(n) + sigma(n)/n). LINKS Jaroslav Krizek, Table of n, a(n) for n = 1..10000 EXAMPLE For n = 9; a(9) = numerator(9/tau(9) + sigma(9)/9) = numerator(9/3 + 13/9) = numerator(40/9) = 40. PROG (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 CROSSREFS Cf. A000005, A000203, A245785, A245786. Sequence in context: A045705 A125822 A025537 * A247068 A028916 A100272 Adjacent sequences:  A245781 A245782 A245783 * A245785 A245786 A245787 KEYWORD nonn,frac AUTHOR Jaroslav Krizek, Aug 15 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)