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A145326
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Least k such that f(n,k) is not a prime, where f(n,1)=4n-1 and f(n,k)=f(f(n,k-1)) for k>=2.
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2
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4, 2, 3, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 3, 1, 2, 3, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 3, 1, 2, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| f(1,1)=3, f(1,2)=11, f(1,3)=43, f(1,4)=171, so a(1)=4.
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CROSSREFS
| Cf. A145325, A145327.
Sequence in context: A096870 A134977 A199081 * A178915 A016513 A063447
Adjacent sequences: A145323 A145324 A145325 * A145327 A145328 A145329
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KEYWORD
| easy,nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu), Oct 07 2008
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