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Search: id:A007573
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| A007573 |
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Number of asymmetric families of palindromic squares.
(Formerly M1319)
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+0
5
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| 1, 2, 5, 6, 9, 10, 10, 15, 15, 16, 18, 24, 18, 26
(list; graph; listen)
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OFFSET
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7,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
M. Keith, Classification and enumeration of palindromic squares, J. Rec. Math., 22 (No. 2, 1990), 124-132.
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LINKS
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P. De Geest, Subsets of Palindromic Squares
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EXAMPLE
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Second term a(9)=2 indicates existence of two length 9 base numbers, 110091011 and 111091111.
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CROSSREFS
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Cf. A002778, A002779.
Sequence in context: A079256 A097685 A136369 this_sequence A143909 A139454 A028946
Adjacent sequences: A007570 A007571 A007572 this_sequence A007574 A007575 A007576
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KEYWORD
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nonn,base
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AUTHOR
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Simon Plouffe, N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
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