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A071066 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. 0
2, 3002003, 3303002003033, 9303303002003033039, 7609303303002003033039067, 3007609303303002003033039067003, 9003007609303303002003033039067003009, 3819003007609303303002003033039067003009183 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
G. L. Honaker Jr. and C. Caldwell conjectured that this pyramid has a finite number of terms (about 193 terms).
REFERENCES
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
LINKS
CROSSREFS
Sequence in context: A037051 A283072 A214599 * A337368 A137601 A232962
KEYWORD
easy,nonn,base
AUTHOR
Benoit Cloitre, May 26 2002
STATUS
approved

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Last modified June 12 23:56 EDT 2024. Contains 373362 sequences. (Running on oeis4.)