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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A052072 Smallest cubes whose digits occur with the same frequency n. 5
0, 1331, 700227072, 22676697737363992239, 1728999927211172788179288, 256263633328535368685258882625 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..6.

P. De Geest, Numbers whose digits occur with same frequency

EXAMPLE

22676697737363992239 (= 2830479^3) and its digits 2, 3, 6, 7 and 9 each occur four times.

PROG

(Python)

def A052072(n):

    a, b, c = 0, 0, 0

    for i in range(10**9):

        s = str(c)

        for d in set(s):

            if s.count(d) != n:

                break

        else:

            return c

        c += a + b + 1

        b += 2*a + 3

        a += 3

return 'search limit reached.'  # Chai Wah Wu, Aug 11 2015

CROSSREFS

Cf. A052071, A052047, A052048, A052051, A052052, A052070.

Sequence in context: A052076 A013795 A013860 * A050646 A044882 A158743

Adjacent sequences:  A052069 A052070 A052071 * A052073 A052074 A052075

KEYWORD

nonn,base,more,nice

AUTHOR

Patrick De Geest, Jan 15 2000

EXTENSIONS

Offset corrected by Michel Marcus, Aug 12 2015

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 September 24 04:27 EDT 2017. Contains 292403 sequences.