A359121 a(n) = number of terms of A068811 that are <= n.

0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12

Offset

1,5

Comments

This is to A068811 as pi = A000720 is to the primes.

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Example

A068811 begins 3, 5, 7, ..., so the present sequence begins 0, 0, 1, 1, 2, 2, 3, ..., with an increment as each term of A068811 is reached.

Mathematica

c = 0; Reap[Do[If[AllTrue[{n, 10^(1 + Floor@ Log10[n]) - n}, PrimeQ], c++]; Sow[c], {n, 86}]][[-1, -1]] (* Michael De Vlieger, Dec 18 2022 *)

Crossrefs

Cf. A000720, A068811.

Sequence in context: A196050 A334097 A122027 * A112751 A316843 A331246

Adjacent sequences: A359118 A359119 A359120 * A359122 A359123 A359124

Keyword

nonn

Author

N. J. A. Sloane, Dec 18 2022

Status

approved