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Search: id:A108654
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| A108654 |
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Numbers n such that 10^n - 117 is prime. |
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+0
1
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| 3, 4, 6, 7, 9, 15, 27, 40, 72, 134, 170, 204, 237, 240, 285, 288, 592, 613, 1443
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OFFSET
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1,1
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EXAMPLE
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If n=3 then 10^n - 117 = 883 (prime).
If n=40 then 10^n - 117 = 9999999999999999999999999999999999999883 (prime).
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MAPLE
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a := proc (n) if isprime(10^n-117) = true then n else end if end proc; seq(a(n), n = 1 .. 1500); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 09 2007
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CROSSREFS
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Adjacent sequences: A108651 A108652 A108653 this_sequence A108655 A108656 A108657
Sequence in context: A066271 A127594 A094604 this_sequence A131530 A102093 A135215
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KEYWORD
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hard,nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jul 06 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 09 2007
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