The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A153025 Numbers n with property that n and n^2 use only prime digits. 2
5, 235, 72335 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Probably there are no other terms. No other terms up to 10^40.
Intersection of A046034 and A275971. - M. F. Hasler, Sep 16 2016
LINKS
EXAMPLE
The squares of 5, 235, 72335 are 25, 55225, 5232352225.
MATHEMATICA
Flatten[Table[Select[FromDigits/@Tuples[{2, 3, 5, 7}, n], AllTrue[ IntegerDigits[ #^2], PrimeQ]&], {n, 5}]] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Oct 16 2014 *)
CROSSREFS
Sequence in context: A157710 A265957 A137085 * A140518 A269551 A200962
KEYWORD
nonn,bref,base
AUTHOR
Zak Seidov, Dec 17 2008
EXTENSIONS
Edited by David Wilson and N. J. A. Sloane, Jan 25 2009
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 16 16:46 EDT 2024. Contains 373432 sequences. (Running on oeis4.)