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Search: id:A050686
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| A050686 |
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Number of palindromes of length n and containing the digit 1 (or any other fixed nonzero digit). |
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+0
2
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| 1, 1, 18, 18, 252, 252, 3168, 3168, 37512, 37512, 427608, 427608, 4748472, 4748472, 51736248, 51736248, 555626232, 555626232, 5900636088, 5900636088, 62105724792, 62105724792, 648951523128, 648951523128, 6740563708152
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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For length 3 we find 18 numbers: 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 212, 313, 414, 515, 616, 717, 818, 919.
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CROSSREFS
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Cf. A050683, A050720.
Sequence in context: A158910 A040307 A022352 this_sequence A165839 A004459 A004507
Adjacent sequences: A050683 A050684 A050685 this_sequence A050687 A050688 A050689
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.
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EXTENSIONS
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More terms from Michael Lugo (mlugo(AT)thelabelguy.com), Dec 22 1999
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