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Search: id:A071066
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| A071066 |
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Palindromic prime pyramid with a(1)=2 such that (number of digits in a(n+1)) = (number of digits in a(n)) + 6; a(n) is as small as possible. |
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| 2, 3002003, 3303002003033, 9303303002003033039, 7609303303002003033039067, 3007609303303002003033039067003, 9003007609303303002003033039067003009, 3819003007609303303002003033039067003009183
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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G. L. Honaker Jr. and C. Caldwell conjectured that this pyramid has a finite number of terms (about 193 terms).
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REFERENCES
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G. L. Honaker Jr. and C. Caldwell, Palindromic prime pyramids.J.Recreational mathematics, vol. 30.3, pp. 169-176,1999-2000
J.-P. Delahaye, "Pour la science", (French edition of Scientific American), Juin 2002, p. 99
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CROSSREFS
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Cf. A070927, A070922.
Sequence in context: A051118 A124368 A037051 this_sequence A137601 A158347 A133495
Adjacent sequences: A071063 A071064 A071065 this_sequence A071067 A071068 A071069
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 26 2002
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