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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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6
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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
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listen;
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OFFSET
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1,1
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LINKS
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Harvey P. Dale and V. Raman, Table of n, a(n) for n = 1..10000 (first 1000 terms from Harvey P. Dale)
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MATHEMATICA
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m3Q[m_]:=Module[{c=10m}, Count[{c+1, c+3, c+7, c+9}, _?PrimeQ]==3]; Select[ Range[ 600], m3Q] (* Harvey P. Dale, Dec 24 2011 *)
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PROG
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(MAGMA) [n: n in [1..600] | #PrimesInInterval(10*n+1, 10*n+9) eq 3]; // Bruno Berselli, Sep 04 2012
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CROSSREFS
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Cf. A007811, A032352, A216292, A216293.
Sequence in context: A147487 A190845 A190805 * A156622 A111314 A316861
Adjacent sequences: A008468 A008469 A008470 * A008472 A008473 A008474
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KEYWORD
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nonn
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AUTHOR
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Olivier Gérard
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STATUS
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approved
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