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A099678
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Numbers n such that 10n01 is a prime.
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2
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3, 5, 6, 15, 17, 20, 21, 23, 27, 30, 38, 47, 48, 54, 56, 57, 65, 68, 71, 72, 83, 84, 90, 92, 102, 105, 110, 116, 122, 126, 134, 135, 143, 155, 156, 162, 164, 173, 182, 183, 197, 198, 200, 201, 203, 204, 210, 213, 222, 225, 227, 231, 233, 236, 249, 261, 264, 270, 281, 282, 290
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MAPLE
| t0:=[]; u0:=[]; for n from 0 to 500 do p0:="10"; p1:="01"; t1:=cat(p0, n, p1); t1:=convert(t1, decimal, 10); if isprime(t1) then t0:=[op(t0), n]; u0:=[op(u0), t1]; fi; od: t0;
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MATHEMATICA
| Select[ Range[280], PrimeQ[ FromDigits[Join[{1, 0}, IntegerDigits[ # ], {0, 1}]]] &] (from Robert G. Wilson v Nov 20 2004)
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CROSSREFS
| Cf. A032672, A100502 (for the primes).
Sequence in context: A112863 A180694 A030052 * A192119 A050563 A168156
Adjacent sequences: A099675 A099676 A099677 * A099679 A099680 A099681
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 19 2004
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