A235695 Semiprimes which have one or more occurrences of exactly seven different digits.

1023469, 1023479, 1023547, 1023574, 1023586, 1023647, 1023649, 1023657, 1023689, 1023745, 1023746, 1023749, 1023794, 1023847, 1023879, 1023965, 1023985, 1024367, 1024369, 1024537, 1024538, 1024563, 1024567, 1024583, 1024637, 1024679, 1024687, 1024735

Offset

1,1

Links

Table of n, a(n) for n=1..28.

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(1030000); s=[]; for(n=1, #b, if(#vecsort(eval(Vec(Str(b[n]))), , 8)==7, s=concat(s, b[n]))); s

Crossrefs

Cf. A235690-A235694, A235696.

Cf. A235154-A235161.

Sequence in context: A218019 A074667 A235159 * A206053 A263129 A241790

Adjacent sequences: A235692 A235693 A235694 * A235696 A235697 A235698

Keyword

nonn,base

Author

Colin Barker, Jan 14 2014

Status

approved