A220343 The number of decades below 10^n whose semiprime pattern is the same as semiprime pattern in the previous decade.

0, 0, 7, 114, 1794, 24605

Offset: 1

Author

Robert G. Wilson v, Jonathan Vos Post, Dec 11 2012

Keywords

• nonn
• base

Examples

			a(3) = 7 because the 7 values less than 10^3 are 104, 389, 435, 438, 529, 658, 884.
		

Crossrefs

Cf. A220063.