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A122862
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Numbers k such that (9*10^k-11)/7 is prime.
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1
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OFFSET
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1,1
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COMMENTS
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All terms are of the form 2+6*k, k=0,1,... Next term > 7220. Are there any n's such that (9*10^n-11)/p is prime for prime p<>7? Cf. A100275 = Numbers n such that 9*10^n-11 is prime.
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LINKS
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MATHEMATICA
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Do[If[PrimeQ[(9*10^n-11)/7], Print[n]], {n, 2, 7220, 6}]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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