OFFSET
0,2
COMMENTS
FORMULA
a(n) = numerator(10*n/(n+5)), n >= 0.
a(n) = 10*n/gcd(n+5,10*n) = 10*n/gcd(n+5,50), n >= 0.
EXAMPLE
The rationals H(n,5) begin: 0, 5/3, 20/7, 15/4, 40/9, 5, 60/11, 35/6, 80/13, 45/7, 20/3, 55/8, 120/17, 65/9, ...
MATHEMATICA
Table[Numerator[(10 n / (n + 5))], {n, 0, 60}] (* Vincenzo Librandi, Nov 06 2016 *)
PROG
(PARI) a(n) = numerator(10*n/(n+5)); \\ Michel Marcus, Nov 06 2016
(Magma) [Numerator(10*n/(n+5)): n in [0..60]]; // Vincenzo Librandi, Nov 06 2016
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Wolfdieter Lang, Jul 01 2013
STATUS
approved