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A204657
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Numbers n such that n!10+2 is prime.
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7
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0, 1, 3, 5, 9, 11, 13, 19, 21, 25, 41, 57, 79, 127, 135, 149, 165, 177, 193, 209, 223, 255, 273, 287, 297, 375, 433, 459, 481, 565, 1079, 1435, 1543, 1771, 1913, 1983, 2063, 2305, 2653, 8757, 11149, 13671, 15433, 16369, 17261, 18129, 22129, 22785, 22875, 25235, 25247, 26329, 27675, 33391, 39075, 41195, 47435, 47621, 48409
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OFFSET
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1,3
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COMMENTS
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n!10 = product( n-10k, 0 <= k < n/10 ).
a(60) > 50,000. - Robert Price, June 10 2012
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LINKS
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Table of n, a(n) for n=1..59.
Nathan Russell, n!10+2 results, primenumbers group, Jan 2012
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PROG
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(PARI) for(n=0, 9999, isprime(prod(i=0, (n-2)\10, n-10*i)+2)& print1(n", "))
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CROSSREFS
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Cf. A204658, A204659, A204660, A204661, A204662, A204663, A204664, A156165, A156167, A085150, A085148, A085146, A037083, A080778, A002981.
Sequence in context: A161781 A007950 A034936 * A167791 A139099 A152259
Adjacent sequences: A204654 A204655 A204656 * A204658 A204659 A204660
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KEYWORD
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nonn,hard
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AUTHOR
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M. F. Hasler, Jan 17 2012
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EXTENSIONS
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a(40)-a(59) from Robert Price, Jun 10 2012
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STATUS
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approved
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