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

Offset: 1

Author

Zak Seidov, Nov 12 2021

Keywords

• nonn
• base

Comments

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

Crossrefs

Cf. A001358.

Subsequence of A107342.

Programs

PARI

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