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

1,1

Comments

The first term having a repeated digit is 10027.

Links

Table of n, a(n) for n=1..43.

Prog

(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

Crossrefs

Cf. A235690, A235691, A235693-A235696.

Cf. A235154-A235161.

Sequence in context: A229000 A168153 A246245 * A247947 A066133 A119455

Adjacent sequences: A235689 A235690 A235691 * A235693 A235694 A235695

Keyword

nonn,base

Author

Colin Barker, Jan 14 2014

Status

approved