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

1,1

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.

Sequence in context: A270259 A205407 A045305 * A250238 A234125 A259423

Adjacent sequences: A349272 A349273 A349274 * A349276 A349277 A349278

Keyword

nonn,base

Author

Zak Seidov, Nov 12 2021

Status

approved