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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A045813 Base-4 numbers whose list of divisors (in base 4) contains each digit 0-3 the same number of times. 1
 320, 20132, 21320, 22033, 23201, 30023, 30203, 30320, 32320, 321202, 1002233, 1002323, 1022033, 1022303, 1032023, 1200323, 1202033, 1202303, 1230203, 1232003, 1300223, 1302023, 1302203, 1320023, 2003201, 2003213, 2003231, 2003312, 2012303, 2013032, 2013212 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Naohiro Nomoto, In the list of divisors of n, ... EXAMPLE Divisors of 32320 are {1, 2, 10, 13, 20, 32, 101, 130, 202, 320, 1010, 1313, 2020, 3232, 13130, 32320} in base 4; each digit appears 12 times. PROG (Python) from sympy import divisors from collections import Counter from sympy.ntheory import digits def b4(n): return int("".join(map(str, digits(n, 4)[1:]))) def ok(n): c = Counter() for d in divisors(n, generator=True): c.update(digits(d, 4)[1:]) return c[0] == c[1] == c[2] == c[3] print([b4(k) for k in range(1, 4**7) if ok(k)]) # Michael S. Branicky, Nov 12 2022 CROSSREFS Cf. A038564, A038565, A045814. Sequence in context: A055863 A168636 A264140 * A121011 A264063 A174778 Adjacent sequences: A045810 A045811 A045812 * A045814 A045815 A045816 KEYWORD nonn,base,easy AUTHOR 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.

Last modified March 22 09:08 EDT 2023. Contains 361423 sequences. (Running on oeis4.)