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

1,1

Comments

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

Links

Table of n, a(n) for n=1..36.

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.

Example

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.

Sequence in context: A328858 A277224 A090741 * A255835 A032234 A032255

Adjacent sequences: A376761 A376762 A376763 * A376765 A376766 A376767

Keyword

nonn

Author

N. J. A. Sloane, Oct 30 2024

Status

approved