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Search: id:A023251
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A023251 Numbers n such that n remains prime through 2 iterations of function f(x) = 4x + 9. +0
1
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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