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Search: id:A023270
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A023270 Numbers n such that n remains prime through 2 iterations of function f(x) = 10x + 9. +0
1
5, 13, 19, 23, 47, 61, 103, 127, 139, 233, 257, 293, 331, 433, 463, 491, 499, 547, 593, 701, 859, 967, 1009, 1013, 1049, 1223, 1321, 1399, 1493, 1567, 1723, 1811, 1867, 1889, 1997, 2039, 2063, 2087, 2137, 2203, 2267, 2273, 2309, 2423, 2437, 2441, 2609, 2633 (list; graph; listen)
OFFSET

1,1

CROSSREFS

Sequence in context: A162174 A118915 A084442 this_sequence A103804 A129919 A045454

Adjacent sequences: A023267 A023268 A023269 this_sequence A023271 A023272 A023273

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified December 20 13:54 EST 2009. Contains 171081 sequences.


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