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A235695 Semiprimes which have one or more occurrences of exactly seven different digits. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 25 16:42 EST 2020. Contains 331245 sequences. (Running on oeis4.)