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Search: id:A122862
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| A122862 |
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Numbers n such that (9*10^n-11)/7 is prime. |
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2
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OFFSET
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1,1
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COMMENT
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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. A102741 Numbers n such that 9*10^n-11 is prime.
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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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CROSSREFS
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Cf. A102741.
Sequence in context: A128697 A089663 A103029 this_sequence A137105 A007082 A135388
Adjacent sequences: A122859 A122860 A122861 this_sequence A122863 A122864 A122865
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 22 2006
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