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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A343043 a(n) = A343042(n, n). 2
0, 1, 6, 9, 12, 15, 120, 127, 150, 153, 156, 159, 240, 247, 270, 273, 300, 303, 360, 367, 390, 393, 420, 423, 5040, 5065, 5166, 5193, 5172, 5199, 5880, 5911, 5910, 5913, 5916, 5919, 6000, 6031, 6030, 6033, 6060, 6063, 6120, 6151, 6150, 6153, 6180, 6183, 10080 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

This sequence has similarities with A087019 and A343047.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 0..5039

Rémy Sigrist, PARI program for A343043

Index entries for sequences related to dismal (or lunar) arithmetic

Index entries for sequences related to factorial base representation

FORMULA

a(k!) = (2*k-1)! for any k > 0.

a(A007489(k)) = A007489(2*k-1) for any k > 0.

EXAMPLE

For n = 42:

- the factorial base representation of 42 is "1300", so:

              1 3 0 0

            x 1 3 0 0

            ---------

              0 0 0 0

            0 0 0 0

          1 3 0 0

      + 1 1 0 0

      ---------------

        1 1 3 0 0 0 0

- hence a(42) = 7! + 6! + 3*5! = 6120.

PROG

(PARI) See Links section.

CROSSREFS

Cf. A007489, A087019, A343042, A343047.

Sequence in context: A297667 A315955 A315956 * A343047 A023040 A001474

Adjacent sequences:  A343040 A343041 A343042 * A343044 A343045 A343046

KEYWORD

nonn,base

AUTHOR

Rémy Sigrist, Apr 05 2021

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 13 12:02 EDT 2021. Contains 343839 sequences. (Running on oeis4.)