The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A083158 Palindromes which are the arithmetic mean of two distinct palindromes. 1
 2, 3, 4, 5, 6, 7, 8, 9, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292, 303, 313, 323, 333, 343, 353, 363, 373, 383, 393, 404, 414, 424, 434, 444, 454, 464, 474, 484, 494, 505 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The palindromes not in the sequence are 11, 10901, 109901,... (A114120). - Giovanni Resta, Feb 06 2006 LINKS Table of n, a(n) for n=1..57. EXAMPLE 99 = (121+77)/2 is a member but 11 is not a member. 191 is in the sequence since it is the arithmetic mean of two distinct palindromes, 9 and 373. CROSSREFS Cf. A083157, A114120. Sequence in context: A318276 A274126 A108194 * A254956 A061013 A037264 Adjacent sequences: A083155 A083156 A083157 * A083159 A083160 A083161 KEYWORD base,easy,nonn AUTHOR Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 25 2003 EXTENSIONS More terms from Giovanni Resta, Feb 06 2006 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.

Last modified March 1 22:23 EST 2024. Contains 370443 sequences. (Running on oeis4.)