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A101471
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Numbers n such that the number n11 is prime.
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4
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0, 2, 3, 8, 9, 15, 18, 20, 21, 23, 24, 27, 30, 35, 39, 41, 42, 50, 57, 60, 62, 63, 69, 72, 74, 80, 81, 83, 90, 93, 95, 98, 101, 102, 107, 113, 114, 120, 122, 125, 126, 129, 134, 137, 140, 144, 155, 161, 164, 168, 170, 179, 182, 183, 189, 192, 200, 204, 206, 210, 212
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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If n=2, then n11 = 211 (prime);
If n=50, then n11 = 5011 (prime);
If n=98, then n11 = 9811 (prime).
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MAPLE
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select(t -> isprime(100*t+11), [$0..1000]); # Robert Israel, Jul 30 2015
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MATHEMATICA
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Select[ Range[0, 215], PrimeQ[ FromDigits[ Flatten[ IntegerDigits /@ { #, 1, 1}]]] &] (* Robert G. Wilson v, Feb 21 2005 *)
Select[Range[0, 250], PrimeQ[100#+11]&] (* Harvey P. Dale, Oct 11 2018 *)
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PROG
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(Magma) [n: n in [0..250] | IsPrime(Seqint(Intseq(11) cat Intseq(n)))] /* or */ [n: n in [0..240] |IsPrime(100*n+11)]; // Vincenzo Librandi, Jul 31 2015
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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