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A062225
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Numbers k such that the smoothly undulating palindromic number (78*10^k - 87)/99 is a prime.
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0
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3, 5, 21, 27, 95, 2075, 2165, 3047, 3503, 16791, 34883
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OFFSET
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1,1
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COMMENTS
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Prime versus probable prime status and proofs are given in the author's table.
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LINKS
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EXAMPLE
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k=21 -> (78*10^21 - 87)/99 = 787878787878787878787.
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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Patrick De Geest and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001
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EXTENSIONS
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STATUS
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approved
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