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!)
A175823 Numbers n such that gcd(n^2, reverse(n^2)) = n 0
1, 9, 297, 513, 783, 999, 1323, 1331, 4961, 10989, 11979, 12969, 14733, 20402, 29088, 89109, 99999, 109989, 122221, 188887, 210789, 218097, 377199, 477773, 483516, 525503, 718189, 1099989, 2128806, 2920819 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
297 is in the sequence, because 297^2 = 88209, and reverse(88209)=90288 = 297*304
MATHEMATICA
Select[Range[5000000], GCD[FromDigits[Reverse[IntegerDigits[(#)^2 ]]], #^2]==# &]
CROSSREFS
Sequence in context: A332129 A086699 A027834 * A129934 A003303 A371252
KEYWORD
nonn,base
AUTHOR
Michel Lagneau, Sep 13 2010
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 May 21 02:29 EDT 2024. Contains 372720 sequences. (Running on oeis4.)