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A008471
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Exactly 3 out of 10m+1, 10m+3, 10m+7, 10m+9 are primes.
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1
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4, 7, 13, 22, 31, 43, 46, 61, 64, 85, 88, 103, 106, 109, 130, 142, 145, 160, 166, 169, 178, 199, 238, 268, 271, 316, 367, 376, 391, 400, 409, 415, 421, 451, 472, 478, 493, 523, 541, 544, 547, 550, 574
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Harvey P. Dale, Table of n, a(n) for n = 0..1000
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MATHEMATICA
| m3Q[m_]:=Module[{c=10m}, Count[{c+1, c+3, c+7, c+9}, _?PrimeQ]==3]; Select[ Range[ 600], m3Q] (* From Harvey P. Dale, Dec 24 2011 *)
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CROSSREFS
| Sequence in context: A147487 A190845 A190805 * A156622 A111314 A139217
Adjacent sequences: A008468 A008469 A008470 * A008472 A008473 A008474
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KEYWORD
| nonn
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AUTHOR
| Olivier Gerard (olivier.gerard(AT)gmail.com)
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