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A100317
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Numbers n such that exactly one of n-1 and n+1 is prime.
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5
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1, 2, 3, 8, 10, 14, 16, 20, 22, 24, 28, 32, 36, 38, 40, 44, 46, 48, 52, 54, 58, 62, 66, 68, 70, 74, 78, 80, 82, 84, 88, 90, 96, 98, 100, 104, 106, 110, 112, 114, 126, 128, 130, 132, 136, 140, 148, 152, 156, 158, 162, 164, 166, 168, 172, 174, 178, 182, 190, 194, 196, 200
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Beginning with a(2)=3, n such that exactly one of n-1 and n+1 is composite.
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PROG
| (PARI) for(n=1, 500, if(isprime(n-1)+isprime(n+1)==1, print1(n, ", ")))
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CROSSREFS
| Cf. A100318 (at least one of n-1 and n+1 is composite).
Cf. A001477, A169546, A171689, A099049.
Sequence in context: A097053 A190668 A132327 * A060697 A093353 A083799
Adjacent sequences: A100314 A100315 A100316 * A100318 A100319 A100320
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KEYWORD
| nonn
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AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), Nov 13 2004
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