id:A023251 - OEIS Search Results

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Numbers n such that n remains prime through 2 iterations of function f(x) = 4x + 9.

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7, 41, 43, 47, 67, 71, 97, 103, 137, 263, 293, 307, 397, 421, 467, 491, 571, 587, 593, 683, 727, 757, 883, 907, 1021, 1061, 1063, 1097, 1153, 1373, 1427, 1433, 1453, 1523, 1567, 1657, 1747, 1811, 1867, 2141, 2251, 2281, 2287, 2647, 2693, 2791, 2797, 2857, 2927 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`Sequence in context: A165397 A123747 A144421 this_sequence A073501 A080666 A105902` `Adjacent sequences: A023248 A023249 A023250 this_sequence A023252 A023253 A023254`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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