OFFSET
1,1
COMMENTS
The first term having a repeated digit is 1003.
EXAMPLE
91119111691966691969 is a term, because it is made of the 3 digits {1, 6, 9} and is the product of two primes 9397848521 and 9695741689. - Giovanni Resta, Jan 14 2014
MATHEMATICA
Select[Range@999, Length@ Union@ IntegerDigits[#] == 3 && Total[Last /@ FactorInteger[#]] == 2 &] (* Giovanni Resta, Jan 14 2014 *)
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(10000); s=[]; for(n=1, #b, if(#vecsort(eval(Vec(Str(b[n]))), , 8)==3, s=concat(s, b[n]))); s
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Colin Barker, Jan 14 2014
STATUS
approved