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Search: id:A023243
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A023243 Numbers n such that n remains prime through 2 iterations of function f(x) = 2x + 5. +0
3
7, 13, 31, 37, 67, 73, 79, 139, 151, 181, 367, 541, 613, 661, 709, 739, 787, 811, 829, 997, 1087, 1117, 1123, 1249, 1327, 1669, 1753, 1801, 1861, 1999, 2011, 2113, 2179, 2239, 2293, 2473, 2557, 2659, 2713, 2719, 3037, 3181, 3187, 3271, 3301, 3517, 3727, 3793 (list; graph; listen)
OFFSET

1,1

CROSSREFS

Adjacent sequences: A023240 A023241 A023242 this_sequence A023244 A023245 A023246

Sequence in context: A073473 A040084 A046139 this_sequence A087196 A074963 A110912

KEYWORD

nonn

AUTHOR

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

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.


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