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!)
A002781 Palindromic cubes.
(Formerly M4583 N1954)
7

%I M4583 N1954 #34 May 21 2022 14:49:08

%S 0,1,8,343,1331,1030301,1367631,1003003001,10662526601,1000300030001,

%T 1030607060301,1334996994331,1000030000300001,1033394994933301,

%U 1331399339931331,1000003000003000001,1003006007006003001,1331039930399301331

%N Palindromic cubes.

%C a(9) = 1066252601 = 2201^3 is the unique known palindromic cube that has a non-palindromic rootnumber (see comments in A002780 and Penguin reference). - _Bernard Schott_, Oct 21 2021

%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%D David Wells, The Penguin Dictionary of Curious and Interesting Numbers (Revised Edition), Penguin Books, 1997, entry 10662526601, page 188.

%H T. D. Noe, <a href="/A002781/b002781.txt">Table of n, a(n) for n = 1..89</a> (from De Geest)

%H Patrick De Geest, <a href="http://www.worldofnumbers.com/cube.htm">Palindromic Cubes</a>

%H G. J. Simmons, <a href="/A002778/a002778_2.pdf">Palindromic powers</a>, J. Rec. Math., 3 (No. 2, 1970), 93-98. [Annotated scanned copy]

%H G. J. Simmons, <a href="/A002778/a002778.pdf">On palindromic squares of non-palindromic numbers</a>, J. Rec. Math., 5 (No. 1, 1972), 11-19. [Annotated scanned copy]

%H G. J. Simmons, <a href="https://www.fq.math.ca/Scanned/8-5/elementary8-5.pdf">Palindrome cubes: Problem B-183</a>, Fibonacci Quart. 8 (1970), no. 5, p. 551.

%F a(n) = A002780(n)^3.

%t Select[Range[0,12*10^5]^3,PalindromeQ[#]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Feb 02 2017 *)

%o (PARI) ispal(x) = my(d=digits(x)); d == Vecrev(d); \\ A002113

%o lista(nn) = my(list = List(), c); for (n=0, sqrtnint(nn, 3), if (ispal(c=n^3), listput(list, c));); Vec(list); \\ _Michel Marcus_, Oct 21 2021

%Y Cf. A002780.

%Y Intersection of A000578 and A002113.

%K base,nonn,nice

%O 1,3

%A _N. J. A. Sloane_

%E Thanks to Pierre Genix (Pierre.Genix(AT)wanadoo.fr) and _Harvey P. Dale_ who pointed out that there were errors in earlier versions of this sequence.

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 April 19 23:15 EDT 2024. Contains 371798 sequences. (Running on oeis4.)