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!)
A098775 Palindromic abundant numbers. 1
66, 88, 222, 252, 272, 282, 414, 444, 464, 474, 606, 616, 636, 666, 696, 828, 858, 868, 888, 2002, 2112, 2442, 2552, 2772, 2992, 4004, 4224, 4554, 4664, 4884, 5775, 6006, 6336, 6666, 6776, 6996, 8008, 8118, 8228, 8448, 8778, 8888, 20202, 20502, 20802 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
a(2) = 88 because 88 is the second abundant number which is palindromic also.
MATHEMATICA
Select[Range[20802], PalindromeQ[#] && DivisorSigma[1, #] > 2 * # &] (* Amiram Eldar, Aug 23 2020 *)
CROSSREFS
Intersection of A002113 and A005101.
Sequence in context: A257029 A223734 A031411 * A109759 A194196 A281937
KEYWORD
easy,nonn,base
AUTHOR
Shyam Sunder Gupta, Oct 03 2004
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 April 15 14:58 EDT 2024. Contains 371692 sequences. (Running on oeis4.)