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A096057
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a(1) = 1, a(n) = least prime divisor of b(n), where b(1) = 1, b(n) = n*b(n-1) + 1 = A002627(n).
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1
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1, 3, 2, 41, 2, 1237, 2, 29, 2, 43, 2, 5, 2, 5, 2, 35951249665217, 2, 28001, 2, 1409, 2, 5, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(4) = 41 because b(3) = 3*b(2)+1 = 3*3+1 = 10 and 4*10+1 = 41, which is prime.
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FORMULA
| Equals A020639(A002627(n)).
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EXAMPLE
| b(n) = 1, 3, 10, 41, ... with least prime divisors a(n) = 1, 3, 2, 41, ....
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CROSSREFS
| Cf. A096058.
Cf. A020639, A002627, A096058.
Sequence in context: A136635 A062743 A009084 * A179984 A065085 A093398
Adjacent sequences: A096054 A096055 A096056 * A096058 A096059 A096060
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 17 2004
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EXTENSIONS
| Corrected and extended by Ray G. Opao (1260(AT)email.com), Aug 02 2004
Edited by Jonathan Sondow (jsondow(AT)alumni.princeton.edu), Jan 09 2005
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