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Search: id:A054658
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| A054658 |
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Primes beginning 1, 3, 7, 9 whose reversals are nonprimes. |
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+0
1
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| 19, 103, 109, 127, 137, 139, 163, 173, 193, 197, 307, 317, 331, 349, 367, 379, 397, 719, 773, 911, 947, 977, 997, 1013, 1019, 1039, 1049, 1051, 1063, 1087, 1093, 1117, 1123, 1129, 1163, 1171, 1187, 1277, 1289, 1291, 1297, 1303, 1307, 1319, 1327, 1361
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Or, primes whose reversals are composites ending in 1,3,7,9. - Lekraj Beedassy (blekraj(AT)yahoo.com), Aug 02 2008
A subsequence of A143260. - Lekraj Beedassy (blekraj(AT)yahoo.com), Aug 02 2008
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EXAMPLE
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a(1)=19 because its reverse is a nonprime, 91.
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CROSSREFS
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Cf. A143260, A076056, A082768.
Sequence in context: A027005 A061696 A062643 this_sequence A023296 A139948 A101010
Adjacent sequences: A054655 A054656 A054657 this_sequence A054659 A054660 A054661
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KEYWORD
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easy,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Apr 18 2000
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 29 2008 at the suggestion of R. J. Mathar
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