A349275 - OEIS

A349275

Semiprimes with only semiprime digits, each appearing at least once.

469, 649, 694, 4469, 4694, 4699, 4946, 6499, 6649, 6694, 9446, 9466, 9469, 9946, 44669, 44966, 44969, 46469, 46946, 46969, 46994, 46999, 49466, 49649, 49694, 49699, 49969, 64469, 64649, 64669, 64949, 64994, 66469, 66494, 66694, 69449, 69469, 69494, 69694, 69949, 94469, 94669, 94699, 94969, 96449, 96494, 96649, 96946, 96949, 96994, 99646, 99649, 444694

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OFFSET

1,1

COMMENTS

Each digits 4, 6, 9 occur at least once. Minimal difference is 3.

LINKS

Table of n, a(n) for n=1..53.

PROG

(PARI) is(n)=bigomega(n)==2 && Set(digits(n))==[4, 6, 9] \\ Charles R Greathouse IV, Nov 12 2021

CROSSREFS

Cf. A001358.

Subsequence of A107342.