A376764 Length of n-th region in A376198.

3, 8, 15, 33, 63, 132, 260, 528, 1057, 2123, 4236, 8464, 16932, 33860, 67732, 135453, 270927, 541836, 1083716, 2167408, 4334796, 8669604, 17339208, 34678448, 69356872, 138713720, 277427448, 554854896, 1109709804, 2219419612, 4438839324, 8877678536, 17755357084, 35510714180, 71021428384, 142042856736

Offset: 1

Author

N. J. A. Sloane, Oct 30 2024

Keywords

• nonn

Comments

We define a region in A376198 to consist of a maximal string of non-prime terms followed by a string of prime terms.

Examples

			The first two regions in A376198 consist of terms 1 to 3 (of length a(1) = 3) and terms 4 to 11 (of length a(2) = 8).
		

Crossrefs

Cf. A063124, A376198, A376752, A376763.

Formula

Apart from the initial 3, this is the first differences of A376752.

This is also, very approximately, the sum of A376763 and a subsequence of A063124.