id:A023252 - OEIS Search Results

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Numbers n such that n remains prime through 2 iterations of function f(x) = 5x + 2.

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13, 19, 31, 79, 97, 199, 331, 349, 373, 457, 541, 577, 607, 643, 709, 769, 811, 859, 1021, 1069, 1171, 1249, 1321, 1381, 1447, 1483, 1693, 1867, 2113, 2137, 2239, 2539, 2719, 3037, 3061, 3163, 3181, 3187, 3313, 3433, 3463, 3673, 3727, 3853, 3919, 4021, 4639 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`Sequence in context: A040047 A051644 A101408 this_sequence A128342 A088186 A089490` `Adjacent sequences: A023249 A023250 A023251 this_sequence A023253 A023254 A023255`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

AT&T Labs Research