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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A258273 The base in which A256360(n) is multi-narcissistic. 2
3, 3, 7, 5, 5, 8, 7, 21, 7, 4, 31, 17, 9, 4, 8, 23, 4, 17, 11, 4, 57, 30, 11, 18, 73, 4, 27, 8, 22, 13, 6, 91, 47, 33, 15, 18, 5, 111, 9, 15, 7, 27, 68, 7, 17, 157, 80, 55, 28, 19, 43, 6, 183, 32, 21, 18, 211, 107, 73, 21, 4, 14, 241, 64, 37, 53, 23, 5, 273, 46 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Tim Johannes Ohrtmann, Table of n, a(n) for n = 1..49477

EXAMPLE

a(1) = 3 because this is the base in which A256360(1) is a multiple-digit narcissistic number: 5 is 12 in base 3 and 1^2+2^2 = 5.

PROG

(PARI) for(n=3, 1000000, k=0; for(z=2, n, y=n; j=0; L=List(); until(y==0, x=y%z; j++; listinsert(L, x, j); while(!((y%z)==0), y--); y=y/z); t=0; for(p=1, j, t+=L[p]^j); if(n==t, k++; a=z)); if(k==1, print1(a, ", ")))

CROSSREFS

Cf. A256360.

Sequence in context: A343996 A118362 A339020 * A205680 A137695 A338768

Adjacent sequences:  A258270 A258271 A258272 * A258274 A258275 A258276

KEYWORD

nonn,base

AUTHOR

Tim Johannes Ohrtmann, Jun 25 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 18 00:56 EST 2022. Contains 350410 sequences. (Running on oeis4.)