login
A054658
Primes beginning 1, 3, 7, 9 whose reversals are nonprimes.
0
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
OFFSET
1,1
COMMENTS
Or, primes whose reversals are composites ending in 1,3,7,9. - Lekraj Beedassy, Aug 02 2008
A subsequence of A143260. - Lekraj Beedassy, Aug 02 2008
EXAMPLE
a(1)=19 because its reverse is a nonprime, 91.
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Enoch Haga, Apr 18 2000
EXTENSIONS
Edited by N. J. A. Sloane, Aug 29 2008 at the suggestion of R. J. Mathar
STATUS
approved