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A034276
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Smallest prime that generates a prime pyramid of height n.
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3
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11, 29, 2, 5, 41, 251, 43, 145577, 51941, 4372877, 26901631, 366636187
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Let p be prime; look for smallest prime that has previous term as a centered substring and has 2 more digits; repeat until no such prime can be found; then height(p) = number of rows in pyramid.
a(13) > 10^10. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Aug 13 2010]
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LINKS
| H. Heinz, Patterns in Primes, Illustrating Two Prime Pyramids
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EXAMPLE
| Example for p=43: 43 3433 334333 93343339 3933433393 939334333939 39393343339393, stop; height(43)=7.
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CROSSREFS
| Cf. A047076, A053600, A052205, A046210, A052091, A052092.
Sequence in context: A140677 A018944 A061086 * A196357 A196360 A072711
Adjacent sequences: A034273 A034274 A034275 * A034277 A034278 A034279
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KEYWORD
| nonn,nice,base
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AUTHOR
| Felice Russo (frusso(AT)micron.com), Jan 25 2000
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EXTENSIONS
| More terms from Naohiro Nomoto (6284968128(AT)geocities.co.jp), Jul 14 2001
a(11)-a(12) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Aug 13 2010
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