login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A269984 Numbers n having factorial fractility A269982(n) = 2. 6
4, 5, 8, 9, 12, 14, 16, 18, 22, 23, 24, 26, 27, 32, 33, 37, 38, 39, 48, 49, 53, 54, 57, 58, 61, 64, 66, 78, 81, 83, 86, 87, 96, 97, 101, 107, 113, 114, 121, 129, 131, 139, 163, 169, 174, 178, 181, 193 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A269982 for a definition of factorial fractility and guide to related sequences.

LINKS

Table of n, a(n) for n=1..48.

EXAMPLE

NI(1/5) = (2, 3, 2, 1, 1, 1, 2, 3, 2, 1, 1, 1, 2, 3, 2, ...)

NI(2/5) = (2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, ...)

NI(3/5) = (1, 2, 3, 2, 1, 1, 1, 2, 3, 2, 1, 1, 1, 2, 3, ...)

NI(4/5) = (1, 1, 2, 3, 2, 1, 1, 1, 2, 3, 2, 1, 1, 1, 2, ...)

so that there are 2 equivalences classes for n = 5, and the fractility of 5 is 2.

PROG

(PARI) select( is_A269984(n)=A269982(n)==2, [1..300]) \\ M. F. Hasler, Nov 05 2018

CROSSREFS

Cf. A000142 (factorial numbers), A269982 (factorial fractility of n); A269983, A269985, A269986, A269987, A269988 (numbers with factorial fractility 1, 3, ..., 6, respectively).

Cf. A269570 (binary fractility), A270000 (harmonic fractility).

Sequence in context: A190671 A042948 A126001 * A188085 A316097 A206554

Adjacent sequences:  A269981 A269982 A269983 * A269985 A269986 A269987

KEYWORD

nonn,more,changed

AUTHOR

Clark Kimberling and Peter J. C. Moses, Mar 11 2016

EXTENSIONS

Edited by M. F. Hasler, Nov 05 2018

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 20 06:06 EST 2018. Contains 317385 sequences. (Running on oeis4.)