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Search: id:A084745
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| A084745 |
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Smallest prime of the form n^k - k, or 0 if no such prime exists. |
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+0
2
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| 2, 2, 3, 23, 5, 47, 7, 79, 997, 5559917313492231463, 11, 167, 13, 223, 4093, 24137563, 17, 359, 19, 439, 10947877107572929152919737180202022857988400441953615831
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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a(11 > 379749833583227. Conjecture: No entry is zero.
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EXAMPLE
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a(7) = 47 = 7^2 -2.
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MAPLE
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a := proc(n) local k; k := 1; while not isprime(n^k-k) do k := k+1 od; n^k-k end: seq(a(n), n=2..35);
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CROSSREFS
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Cf. A084746.
Sequence in context: A049132 A087768 A113604 this_sequence A036503 A109590 A074935
Adjacent sequences: A084742 A084743 A084744 this_sequence A084746 A084747 A084748
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Jun 15 2003
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EXTENSIONS
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More terms from Alec Mihailovs (Alec(AT)Mihailovs.com), Jun 16 2003. The next term is too large to include.
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