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A062224
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Numbers k such that the smoothly undulating palindromic number (75*10^k - 57)/99 is a prime.
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0
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3, 17, 77, 143, 149, 513, 1079, 1415, 6249, 13265, 14579, 15293, 41657, 72941
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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=17 -> (75*10^17 - 57)/99 = 75757575757575757.
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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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