A235692 - OEIS

%I #7 Apr 29 2014 22:49:29

%S 1027,1037,1042,1043,1046,1047,1057,1059,1067,1073,1079,1082,1094,

%T 1203,1205,1207,1234,1238,1243,1247,1253,1257,1263,1267,1273,1285,

%U 1286,1293,1294,1306,1329,1345,1346,1347,1349,1354,1357,1369,1379,1382,1385,1387,1389

%N Semiprimes which have one or more occurrences of exactly four different digits.

%C The first term having a repeated digit is 10027.

%o (PARI)

%o list(lim)=my(v=List(), t); forprime(p=2, sqrt(lim), t=p; forprime(q=p, lim\t, listput(v, t*q))); vecsort(Vec(v)) \\ From A001358

%o b=list(15000); s=[]; for(n=1, #b, if(#vecsort(eval(Vec(Str(b[n]))),,8)==4, s=concat(s, b[n]))); s

%Y Cf. A235690, A235691, A235693-A235696.

%Y Cf. A235154-A235161.

%K nonn,base

%O 1,1

%A _Colin Barker_, Jan 14 2014