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!)
A002942 a(n) = n^2 written backwards.
(Formerly M3370 N1357)
14
1, 4, 9, 61, 52, 63, 94, 46, 18, 1, 121, 441, 961, 691, 522, 652, 982, 423, 163, 4, 144, 484, 925, 675, 526, 676, 927, 487, 148, 9, 169, 4201, 9801, 6511, 5221, 6921, 9631, 4441, 1251, 61, 1861, 4671, 9481, 6391, 5202, 6112, 9022, 4032, 1042, 52, 1062 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
a(n) = A004086(A000290(n)). - Reinhard Zumkeller, Sep 18 2013
REFERENCES
GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See page 103.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
EXAMPLE
12*12 = 144, which written backwards is 441, so a(12) = 441.
10*10 = 100, so a(10) = 001 = 1.
MAPLE
a:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(""||(n^2)):
seq(a(n), n=1..60); # Alois P. Heinz, May 20 2022
MATHEMATICA
Table[FromDigits[Reverse[IntegerDigits[n^2]]], {n, 1, 40}] (* Geoffrey Critzer, Dec 04 2011 *)
PROG
(Haskell)
a002942 = a004086 . a000290 -- Reinhard Zumkeller, Sep 18 2013
(Magma) [Seqint(Reverse(Intseq(n^2))): n in [1..60]]; // Vincenzo Librandi, Sep 21 2015
CROSSREFS
Sequence in context: A309444 A198178 A013571 * A028908 A265148 A220445
KEYWORD
nonn,base,easy,look
AUTHOR
EXTENSIONS
More terms from Jeremy Gardiner, Sep 08 2002
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 March 28 14:33 EDT 2024. Contains 371254 sequences. (Running on oeis4.)