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A059170
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Strictly undulating primes (digits alternate and differ by 1).
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1
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2, 3, 5, 7, 23, 43, 67, 89, 101, 787, 32323, 78787, 1212121, 323232323, 989898989, 12121212121, 32323232323, 787878787878787878787, 787878787878787878787878787
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| Of form ababa... with |a-b| = 1.
C. A. Pickover, "Keys to Infinity", Wiley 1995, p. 159,160.
C. A. Pickover, "Wonders of Numbers", Oxford New York 2001, Chapter 52, pp. 123-124, 316-317.
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LINKS
| P. De Geest, More undulating primes
C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
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CROSSREFS
| Cf. A032758, A059168, A048398, A033619, A046075, A059758.
Sequence in context: A155873 A106711 A048398 * A068710 A120805 A177119
Adjacent sequences: A059167 A059168 A059169 * A059171 A059172 A059173
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 14 2001
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EXTENSIONS
| Extended by Patrick De Geest (pdg(AT)worldofnumbers.com), Feb 25 2001.
Offset corrected by Arkadiusz Wesolowski, Sep 13 2011
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