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A054658 Primes beginning 1, 3, 7, 9 whose reversals are nonprimes. 0

%I #10 Jan 04 2013 16:26:07

%S 19,103,109,127,137,139,163,173,193,197,307,317,331,349,367,379,397,

%T 719,773,911,947,977,997,1013,1019,1039,1049,1051,1063,1087,1093,1117,

%U 1123,1129,1163,1171,1187,1277,1289,1291,1297,1303,1307,1319,1327,1361

%N Primes beginning 1, 3, 7, 9 whose reversals are nonprimes.

%C Or, primes whose reversals are composites ending in 1,3,7,9. - _Lekraj Beedassy_, Aug 02 2008

%C A subsequence of A143260. - _Lekraj Beedassy_, Aug 02 2008

%e a(1)=19 because its reverse is a nonprime, 91.

%Y Cf. A143260, A076056, A082768.

%K easy,nonn,base

%O 1,1

%A _Enoch Haga_, Apr 18 2000

%E Edited by _N. J. A. Sloane_, Aug 29 2008 at the suggestion of R. J. Mathar

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Last modified May 15 21:35 EDT 2024. Contains 372549 sequences. (Running on oeis4.)