|
Search: id:A064021
|
|
|
| A064021 |
|
Take the square root of n, reverse its digits, square that and the result is n with its digits reversed. |
|
+0
2
|
|
| 144, 169, 441, 961, 10404, 10609, 12544, 12769, 14884, 40401, 44521, 48841, 90601, 96721, 1004004, 1006009, 1022121, 1024144, 1026169, 1042441, 1044484, 1062961, 1212201, 1214404, 1216609, 1236544, 1238769, 1256641, 1258884, 1442401
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Elements of A033294 that are not palindromes. - Walter A. Kehowski (wkehowski(AT)cox.net), May 22 2008
|
|
REFERENCES
|
David Wells, The Penguin Dictionary of Curious and Interesting Numbers, pp. 124, 127 (Rev. ed. 1997).
|
|
LINKS
|
Harry J. Smith, Table of n, a(n) for n=1,...,750
|
|
EXAMPLE
|
1026169 is included because its square root, 1013, when reversed (i.e. 3101) and squared yields 9616201.
|
|
PROGRAM
|
(PARI) Rev(x)= { local(d, r); r=0; while (x>0, d=x-10*(x\10); x\=10; r=r*10 + d); return(r) } { n=0; for (m=1, 10^9, if (m%10==0, next); x=m^2; r=Rev(x); if (r==x, next); if (r==Rev(m)^2, write("b064021.txt", n++, " ", x); if (n==750, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 06 2009]
|
|
CROSSREFS
|
Cf. A035124.
Cf. A033294.
Sequence in context: A034289 A062917 A035090 this_sequence A156316 A165076 A165078
Adjacent sequences: A064018 A064019 A064020 this_sequence A064022 A064023 A064024
|
|
KEYWORD
|
nonn,base,nice
|
|
AUTHOR
|
Harvey P. Dale (hpd1(AT)nyu.edu), Sep 18 2001
|
|
|
Search completed in 0.002 seconds
|
