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A032682
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Numbers n such that n surrounded by digit '1' is a prime.
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11
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0, 3, 5, 8, 9, 15, 17, 18, 20, 23, 29, 30, 32, 36, 38, 45, 47, 48, 51, 53, 57, 60, 62, 72, 74, 80, 81, 83, 86, 87, 90, 93, 95, 107, 113, 116, 117, 125, 126, 131, 132, 135, 141, 147, 149, 155, 162, 168, 170, 173, 180, 182, 183, 194, 197, 198, 201, 204, 207, 210
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MAPLE
| t0:=[]; u0:=[]; for n from 1 to 100 do t1:=cat(1, n, 1); t1:=convert(t1, decimal, 10); if isprime(t1) then t0:=[op(t0), n]; u0:=[op(u0), t1]; fi; od: t0;
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CROSSREFS
| The primes are in A099677. Cf. A032686.
Sequence in context: A138808 A185456 A018804 * A022769 A067241 A120943
Adjacent sequences: A032679 A032680 A032681 * A032683 A032684 A032685
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.
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