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A099630
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Smallest and largest primes pairwise displayed with k digits from k=2,3,... with repeated decimal digits.
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0
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11, 11, 101, 997, 1009, 9973, 10007, 99991, 100003, 999983, 1000003, 9999991, 10000019, 99999989, 100000007, 999999937, 1000000007, 9999999967, 10000000019, 99999999977, 100000000003, 999999999989, 1000000000039, 9999999999971, 10000000000037, 99999999999973
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OFFSET
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1,1
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COMMENTS
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Contrary to A099629, this sequence is evidently infinite. Essentially [for more than 2 digits] consists of pairs of {nextprime[10^j],prevprime[10^(j+1)]}.
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LINKS
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MATHEMATICA
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Join[{11, 11}, Flatten[Table[{NextPrime[10^n], NextPrime[10^(n+1), -1]}, {n, 2, 20}]]] (* Harvey P. Dale, Jun 04 2018 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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