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!)
A084024 Triangle read by rows in which row n gives n smallest n-digit multiples of n that are palindromes. 4
1, 22, 44, 111, 141, 171, 2112, 2332, 2552, 2772, 50005, 50105, 50205, 50305, 50405, 201102, 204402, 207702, 210012, 213312, 216612, 1002001, 1009001, 1011101, 1018101, 1020201, 1027201, 1036301, 21100112, 21111112, 21122112, 21133112, 21144112, 21155112, 21166112, 21177112 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
T(n, 1) >= A053041(n); T(n, 1) = A083123(n). - Michel Marcus, Mar 28 2020
EXAMPLE
1
22 44
111 141 171
2112 2332 2552 2772
...
MATHEMATICA
snm[n_]:=Module[{a=Floor[10^(n-1)], b=Floor[10^n-1]}, Select[ Select[ Range[ a, b], Divisible[#, n]&&IntegerLength[#]==n&], PalindromeQ, n]]; Array[ snm, 8]//Flatten (* Harvey P. Dale, Aug 23 2020 *)
PROG
(PARI) isok(k, n) = my(d=digits(k*n)); (#d == n) && (Vecrev(d) == d);
row(n) = {my(v=vector(n), k = ceil(10^(n-1)/n)); for (i=1, n, while(! isok(k, n), k++); v[i] = k*n; k++; ); v; } \\ Michel Marcus, Mar 28 2020
CROSSREFS
Sequence in context: A071266 A038153 A033848 * A342171 A092328 A138869
KEYWORD
base,nonn,tabl
AUTHOR
Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 23 2003
EXTENSIONS
Corrected and extended by Ray Chandler, Jun 12 2003
More terms from Michel Marcus, Mar 28 2020
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 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)