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A145326 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. 2
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; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

f(1,1)=3, f(1,2)=11, f(1,3)=43, f(1,4)=171, so a(1)=4.

CROSSREFS

Cf. A145325, A145327.

Sequence in context: A266147 A231169 A297847 * A178915 A222221 A254043

Adjacent sequences:  A145323 A145324 A145325 * A145327 A145328 A145329

KEYWORD

easy,nonn

AUTHOR

Clark Kimberling, Oct 07 2008

STATUS

approved

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Last modified May 24 04:25 EDT 2019. Contains 323528 sequences. (Running on oeis4.)