login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A111241 a(n) = A109735(n)/A109890(n+1). 3
1, 1, 3, 2, 2, 4, 9, 5, 4, 3, 5, 5, 9, 5, 4, 8, 15, 8, 12, 27, 52, 7, 4, 2, 5, 3, 6, 106, 14, 5, 9, 5, 4, 6, 107, 180, 21, 362, 121, 183, 176, 69, 59, 150, 28, 151, 232, 19, 10, 2, 11, 9, 233, 360, 247, 304, 155, 244, 195, 98, 231, 174, 196, 50, 591, 296, 198, 51, 199 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,3
COMMENTS
This is always an integer for n>=2.
a(n) = 1 for n in A111315. When this happens A109890(n+1) makes a large jump. The corresponding values of A109890(n+1) are in A111316 (cf. A111242).
LINKS
FORMULA
a(n) = A094340(n) for all n > 1. - David Wasserman, Jan 06 2009
EXAMPLE
A109735(4)=12, A109890(5)=4, so a(4) = 12/4 = 3.
MATHEMATICA
nn = 71; c[_] := False;
Array[Set[{a[#], c[#]}, {#, True}] &, 2]; s = a[1] + a[2];
Reap[Do[k = SelectFirst[Divisors[s], ! c[#] &];
c[k] = True; Sow[s/k];
s += k, {n, 3, nn}] ][[-1, 1]] (* Michael De Vlieger, Apr 26 2024 *)
CROSSREFS
Different from A094339.
Sequence in context: A254876 A249159 A230871 * A345055 A247501 A192183
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 30 2005
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 22 19:00 EDT 2024. Contains 374540 sequences. (Running on oeis4.)