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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
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
Sequence in context: A318276 A274126 A108194 * A254956 A061013 A037264
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

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