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!)
A069263 (Sum of digits of n)^3 = sum of digits of n^3. 2
1, 2, 10, 11, 20, 100, 101, 110, 111, 200, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 2000, 10000, 10001, 10010, 10011, 10100, 10101, 10110, 11000, 11001, 11010, 11011, 11100, 20000, 100000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

David A. Corneth, Table of n, a(n) for n = 1..12456 (terms < 10^20)

EXAMPLE

Let s(n) = sum of digits of n. Then s(101)^3 = 8 and s(101^3) = s(1030301) = 8, so 101 belongs to the sequence.

MATHEMATICA

f[n_] := Apply[Plus, IntegerDigits[n]]; Select[Range[10^5], f[ #^3] == f[ # ]^3 &]

PROG

(PARI) is(n)=sumdigits(n^3)==sumdigits(n)^3 \\ Charles R Greathouse IV, Dec 19 2016

CROSSREFS

Cf. A061909.

Sequence in context: A231501 A051373 A131096 * A174569 A179884 A174570

Adjacent sequences:  A069260 A069261 A069262 * A069264 A069265 A069266

KEYWORD

base,nonn

AUTHOR

Joseph L. Pe, Apr 19 2002

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 8 19:52 EDT 2021. Contains 343668 sequences. (Running on oeis4.)