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A083158 Palindromes which are the arithmetic mean of two distinct palindromes. 1

%I #9 Sep 25 2019 03:19:25

%S 2,3,4,5,6,7,8,9,22,33,44,55,66,77,88,99,101,111,121,131,141,151,161,

%T 171,181,191,202,212,222,232,242,252,262,272,282,292,303,313,323,333,

%U 343,353,363,373,383,393,404,414,424,434,444,454,464,474,484,494,505

%N Palindromes which are the arithmetic mean of two distinct palindromes.

%C The palindromes not in the sequence are 11, 10901, 109901,... (A114120). - _Giovanni Resta_, Feb 06 2006

%e 99 = (121+77)/2 is a member but 11 is not a member.

%e 191 is in the sequence since it is the arithmetic mean of two distinct palindromes, 9 and 373.

%Y Cf. A083157, A114120.

%K base,easy,nonn

%O 1,1

%A _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 25 2003

%E More terms from _Giovanni Resta_, Feb 06 2006

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Last modified April 19 17:39 EDT 2024. Contains 371797 sequences. (Running on oeis4.)