id:A064921 - OEIS Search Results

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Iterate A064920 until a prime is reached.

+0
4

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; listen)

	OFFSET	`2,1`
	COMMENT	`Well defined since A064920(n) < n for nonprimes.` `a(p) = p for all primes p.`
	LINKS	`Harry J. Smith, Table of n, a(n) for n=2,...,1000`
	EXAMPLE	`a(18) = 5 as A064920(18) = 8 and A064920(8) = 5.`
	PROGRAM	`(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]`
	CROSSREFS	`Cf. A064920, A064922, A064917.` `Sequence in context: A066858 A152864 A152984 this_sequence A064917 A154727 A065070` `Adjacent sequences: A064918 A064919 A064920 this_sequence A064922 A064923 A064924`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 14 2001`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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