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A057333
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Numbers of n-digit primes that undulate.
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1
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4, 21, 74, 347, 1743, 8385, 44355, 229952, 1235489, 6629026, 37152645
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| '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
| C. A. Pickover, "Wonders of Numbers", Oxford New York 2001, Chapter 52, pp. 123-124, 316-317.
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LINKS
| 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
| Cf. A046075, A033619, A032758, A039944, A016073, A046076, A046077, A057332.
Sequence in context: A095668 A078800 A184706 * A034960 A157493 A192429
Adjacent sequences: A057330 A057331 A057332 * A057334 A057335 A057336
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KEYWORD
| nonn,base,more
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Sep 15 2000.
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EXTENSIONS
| Offset corrected and a(10)-a(11) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Aug 08 2010
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