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A064921
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Iterate A064920 until a prime is reached.
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4
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2, 3, 3, 5, 3, 7, 5, 5, 3, 11, 3, 13, 5, 7, 5, 17, 5, 19, 5, 5, 3, 23, 3, 5, 5, 11, 3, 29, 3, 31, 17, 13, 5, 11, 5, 37, 5, 7, 3, 41, 3, 43, 5, 13, 3, 47, 5, 13, 5, 19, 5, 53, 5, 7, 5, 5, 3, 59, 5, 61, 17, 7, 13, 17, 5, 67, 5, 5, 5, 71, 5, 73, 5, 19, 3, 17, 5, 79, 5, 29, 3, 83, 5, 5, 5, 31, 5
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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COMMENTS
| Well defined since A064920(n) < n for nonprimes.
a(p) = p for all primes p.
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LINKS
| Harry J. Smith, Table of n, a(n) for n=2,...,1000
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EXAMPLE
| a(18) = 5 as A064920(18) = 8 and A064920(8) = 5.
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PROG
| (PARI) gpf(n)= { local(f); f=factor(n)~; return(f[1, length(f)]) } { for (n=2, 1000, m=n; while (!isprime(m), g=gpf(m); m=m / g + g - 1); write("b064921.txt", n, " ", m) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 29 2009]
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CROSSREFS
| Cf. A064920, A064922, A064917.
Sequence in context: A152864 A152984 A177980 * A064917 A154727 A065070
Adjacent sequences: A064918 A064919 A064920 * A064922 A064923 A064924
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 14 2001
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