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Search: id:A057333
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| A057333 |
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Numbers of n-digit primes that undulate. |
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+0
2
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OFFSET
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0,1
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COMMENT
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'Undulate' means that the alternate digits are consistently greater than or less than the digits adjacent to them (e.g. 70769). Smoothly undulating palindromic primes (e.g. 95959) are a subset and included in the count.
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REFERENCES
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C. A. Pickover, "Wonders of Numbers", Oxford New York 2001, Chapter 52, pp. 123-124, 316-317.
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LINKS
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C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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CROSSREFS
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Cf. A046075, A033619, A032758, A039944, A016073, A046076, A046077, A057332.
Adjacent sequences: A057330 A057331 A057332 this_sequence A057334 A057335 A057336
Sequence in context: A089893 A095668 A078800 this_sequence A034960 A134424 A017967
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KEYWORD
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nonn,base,more
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Sep 15 2000.
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