A235692 Semiprimes which have one or more occurrences of exactly four different digits.

1027, 1037, 1042, 1043, 1046, 1047, 1057, 1059, 1067, 1073, 1079, 1082, 1094, 1203, 1205, 1207, 1234, 1238, 1243, 1247, 1253, 1257, 1263, 1267, 1273, 1285, 1286, 1293, 1294, 1306, 1329, 1345, 1346, 1347, 1349, 1354, 1357, 1369, 1379, 1382, 1385, 1387, 1389

Offset: 1

Author

Colin Barker, Jan 14 2014

Keywords

• nonn
• base

Comments

The first term having a repeated digit is 10027.

Crossrefs

Cf. A235690, A235691, A235693-A235696.

Cf. A235154-A235161.

Programs

PARI

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