This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A054658 #15 Dec 02 2024 14:00:45
%S A054658 19,103,109,127,137,139,163,173,193,197,307,317,331,349,367,379,397,
%T A054658 719,773,911,947,977,997,1013,1019,1039,1049,1051,1063,1087,1093,1117,
%U A054658 1123,1129,1163,1171,1187,1277,1289,1291,1297,1303,1307,1319,1327,1361
%N A054658 Primes beginning 1, 3, 7, 9 whose reversals are nonprimes.
%C A054658 Or, primes whose reversals are composites ending in 1,3,7,9. - _Lekraj Beedassy_, Aug 02 2008
%C A054658 A subsequence of A143260. - _Lekraj Beedassy_, Aug 02 2008
%H A054658 Harvey P. Dale, <a href="/A054658/b054658.txt">Table of n, a(n) for n = 1..1000</a>
%e A054658 a(1)=19 because its reverse is a nonprime, 91.
%t A054658 pbQ[p_]:=MemberQ[{1,3,7,9},IntegerDigits[p][[1]]]&&CompositeQ[IntegerReverse[p]]; Select[Prime[Range[300]],pbQ] (* _Harvey P. Dale_, Dec 02 2024 *)
%Y A054658 Cf. A143260, A076056, A082768.
%K A054658 easy,nonn,base
%O A054658 1,1
%A A054658 _Enoch Haga_, Apr 18 2000
%E A054658 Edited by _N. J. A. Sloane_, Aug 29 2008 at the suggestion of R. J. Mathar