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!)
A226971 Numbers k such that the sum of digits of k^7 is equal to k. 2
0, 1, 18, 27, 31, 34, 43, 53, 58, 68 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Only the ten integers listed have this property.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

a(3) = 18 because 18^7 = 612220032 and 6+1+2+2+2+0+0+3+2 = 18.

MATHEMATICA

Select[Range[0, 100], #==Total[IntegerDigits[#^7]]&]

PROG

(MAGMA) [n: n in [0..80] | &+Intseq(n^7) eq n]; // Vincenzo Librandi, Feb 23 2015

(Sage) [n for n in (0..70) if sum((n^7).digits()) == n] # Bruno Berselli, Feb 23 2015

CROSSREFS

Cf. A046459, A055575, A055576, A055577.

Cf. A152147.

Sequence in context: A220100 A080910 A036763 * A281918 A186129 A284672

Adjacent sequences:  A226968 A226969 A226970 * A226972 A226973 A226974

KEYWORD

nonn,base,fini,full

AUTHOR

Michel Lagneau, Jun 24 2013

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 July 9 01:53 EDT 2020. Contains 335537 sequences. (Running on oeis4.)