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

1,2

Links

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

Formula

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

Prog

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

Crossrefs

Cf. A098450.

Sequence in context: A303579 A306966 A286016 * A363252 A070962 A093008

Adjacent sequences: A119317 A119318 A119319 * A119321 A119322 A119323

Keyword

base,nonn

Author

Zak Seidov, May 14 2006

Extensions

More terms from Amiram Eldar, Sep 18 2021

Status

approved