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A114120 Palindromes which are not the arithmetic mean of two distinct positive palindromes. 1
1, 11, 10901, 109901, 1090901, 1099901, 10900901, 10999901, 100909001, 109000901, 109090901, 109909901, 109999901, 1090000901, 1090990901, 1099009901, 1099999901, 10090909001, 10900000901, 10900900901, 10909090901, 10909990901 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
In this sequence 0 is not allowed as an addend. If 0 were allowed then 0 would be a term and 1 and 11 would not. - Yuan-Hao Huang, Aug 31 2020
LINKS
EXAMPLE
191 is not in the sequence since it is the arithmetic mean of two distinct positive palindromes, 9 and 373.
CROSSREFS
Sequence in context: A121520 A308335 A083442 * A118557 A267273 A138713
KEYWORD
base,nonn
AUTHOR
Giovanni Resta, Feb 06 2006
EXTENSIONS
a(1)=1 inserted by Yuan-Hao Huang, Aug 31 2020
STATUS
approved

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Last modified February 29 19:20 EST 2024. Contains 370428 sequences. (Running on oeis4.)