id:A116888 - OEIS Search Results

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

+0
4

306167, 48639197, 64695713, 68252687, 87788237, 87813293, 160486967, 255974437, 283032247, 324609913, 361705873, 417684523, 449364197, 451995587, 454052213, 466037563, 536504713, 574746467, 596095613 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`p=306167, f(p)= 93738231893, f(f(p))= 8786856118425842363453, f(f(f(p)))= 77208840445917661077402487029419236950083213 and the 88-digits f(f(f(f(p)))) are all prime numbers.`
	CROSSREFS	`Cf. A062324, A116886, A116887, A116889.` `Sequence in context: A156999 A111031 A053849 this_sequence A102499 A157417 A104826` `Adjacent sequences: A116885 A116886 A116887 this_sequence A116889 A116890 A116891`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 27 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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