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A032668 Digit '5' concatenated with a(n) is a prime. +0
1
3, 9, 21, 23, 41, 47, 57, 63, 69, 71, 77, 87, 93, 99, 101, 107, 113, 119, 147, 153, 167, 171, 179, 189, 197, 209, 227, 231, 233, 237, 261, 273, 279, 281, 297, 303, 309, 323, 333, 347, 351, 381, 387, 393, 399, 407, 413, 417, 419, 431, 437, 441 (list; graph; listen)
OFFSET

0,1

CROSSREFS

Sequence in context: A128127 A006077 A109612 this_sequence A050839 A032640 A127174

Adjacent sequences: A032665 A032666 A032667 this_sequence A032669 A032670 A032671

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.


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