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A083158
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Palindromes which are the arithmetic mean of two distinct palindromes.
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1
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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; internal format)
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OFFSET
| 1,1
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COMMENTS
| The palindromes not in the sequence are 11, 10901, 109901,... (A116383). - Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006
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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.
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CROSSREFS
| Cf. A083157.
Cf. A083157, A116383.
Sequence in context: A037344 A062998 A108194 * A061013 A037264 A045910
Adjacent sequences: A083155 A083156 A083157 * A083159 A083160 A083161
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Apr 25 2003
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EXTENSIONS
| More terms from Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006
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