A119320 Difference between 10^n and the largest n-digit semiprime.

1, 5, 2, 2, 2, 3, 2, 3, 9, 3, 3, 3, 11, 3, 2, 6, 11, 7, 9, 17, 3, 3, 11, 3, 3, 17, 5, 5, 9, 33, 11, 17, 17, 3, 11, 41, 39, 11, 29, 7, 11, 6, 21, 11, 17, 17, 9, 17, 11, 7, 11, 83, 49, 3, 2, 11, 3, 38, 23, 7, 11, 14, 9, 33, 3, 11, 11, 11, 31, 66, 9, 47, 21, 17, 29

Offset: 1

Author

Zak Seidov, May 14 2006

Keywords

• base
• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..100

Crossrefs

Cf. A098450.

Programs

PARI

a(n) = my(k=10^n-1); while (bigomega(k) != 2, k--); 10^n - k; \\ Michel Marcus, Sep 18 2021

Formula

a(n) = 10^n - A098450(n).

Extensions

More terms from Amiram Eldar, Sep 18 2021