%I
%S 19,127,139,149,151,157,163,181,191,193,199,1117,1123,1129,1153,1171,
%T 1187,1201,1213,1217,1231,1237,1249,1259,1279,1289,1291,1297,1301,
%U 1303,1319,1321,1327,1361,1381,1399,1423,1427,1429,1447,1451,1453,1459,1471
%N Primes from composite numbers by prefixing with 1.
%C The composite numbers are considered in increasing order.
%H Dario Alpern, <a href="http://www.alpertron.com.ar/ECM.HTM">Factorization using the Elliptic Curve Method</a>
%e 1493 is a prime from the composite number 493 by prefixing it with 1.
%Y Cf. A002808
%K base,nonn
%O 1,1
%A _Parthasarathy Nambi_, Aug 30 2009
