login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A028503 Numbers n such that n(n+2) is a palindrome. 2
1, 2, 9, 17, 23, 64, 75, 99, 191, 204, 999, 1747, 1907, 2365, 2966, 5731, 9999, 18991, 20564, 99999, 174601, 174747, 179317, 243063, 293786, 552101, 999999, 1868287, 2967032, 9200156, 9999999, 22765895, 31552659, 93809716 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

P. De Geest, Palindromic quasipronic numbers of the form n(n+2)

CROSSREFS

Cf. A005563, A028504.

Sequence in context: A069622 A200944 A137189 * A100291 A083419 A126082

Adjacent sequences:  A028500 A028501 A028502 * A028504 A028505 A028506

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com)

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 12 03:59 EST 2012. Contains 205360 sequences.