id:A116887 - OEIS Search Results

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Primes p that remain prime through at least 3 iterations of function f(p)=p^2+4.

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5087, 11173, 16657, 47017, 54503, 185243, 207643, 300413, 306167, 341813, 391387, 849047, 1348577, 1438223, 1502923, 1857407, 1909267, 2121737, 2161163, 2288773, 2610133, 2725157, 2744723, 2779097, 2874463, 2881327 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`p=5087, f(p)= 25877573, f(f(p))= 669648784370333 and f(f(f(p)))= 448429494408664742387290530893 are all primes.`
	CROSSREFS	`Cf. A062324, A116886, A116888, A116889.` `Sequence in context: A160757 A046169 A058908 this_sequence A034286 A135842 A025398` `Adjacent sequences: A116884 A116885 A116886 this_sequence A116888 A116889 A116890`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 27 2006`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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