id:A116886 - OEIS Search Results

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

+0
4

3, 17, 103, 137, 277, 313, 677, 743, 1117, 1627, 2003, 2143, 3407, 3677, 4483, 5087, 5903, 7177, 7333, 8087, 8093, 8147, 8537, 8573, 9293, 9473, 10177, 10477, 11173, 13807, 14897, 15107, 16657, 19753, 21563, 22307, 24113, 26113, 26417, 26633 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`17 is prime, 17^2+4=293 is prime and 293^2+4=85853 is prime.`
	CROSSREFS	`Cf. A062324, A116887, A116888, A116889.` `Sequence in context: A001541 A074565 A054365 this_sequence A020069 A020024 A036551` `Adjacent sequences: A116883 A116884 A116885 this_sequence A116887 A116888 A116889`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 27 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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