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Search: id:A093490
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| A093490 |
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a(0) = 2; for n > 0, a(n) is the least prime of the form k*n*a(n-1) - 1. |
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+0
2
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| 2, 3, 5, 29, 347, 3469, 41627, 1748333, 27973327, 1007039771, 70492783969, 7754206236589, 2605413295493903, 6503111585552781887, 4825308796480164160153, 1881870430627264022459669
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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a(3) = 29, a(4) = 3*4*29 - 1 = 347.
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PROGRAM
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(PARI) v=[2]; for(n=2, 20, k=1; while(!isprime(p=k*(n-1)*v[n-1]-1), k++); v=concat(v, p)); v - Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jan 31 2005
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CROSSREFS
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Cf. A103342 (corresponding k values), A091771, A091879.
Adjacent sequences: A093487 A093488 A093489 this_sequence A093491 A093492 A093493
Sequence in context: A084599 A062167 A107451 this_sequence A073309 A110389 A083388
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 16 2004
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com) and Ryan Propper (rpropper(AT)stanford.edu), Jan 31 2005
Edited by njas at the suggestion of Andrew Plewe, May 14 2007
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