A092852 Number of composites <= A092802(n).

2, 36, 412, 4371, 45118, 460161, 4663480, 47087659, 474329018, 4770493824, 47924729801, 481060418376, 4825817782189, 48387664042144, 484992123875142, 4859631205206357, 48681601698828085, 487571138851821274, 4882443976989269954, 48884842829781286250, 489393391263430721900

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Formula

a(n) = A065855(A092802(n)) = A062298(A092802(n)) - 1 = A092802(n) - A000720(A092802(n)) - 1.

Example

Up to 10^1 there are 4 composites: 4 + 6 + 8 + 9 = 27. The rounded mean is A092802(1) = floor(27/4) = 7. There are 2 composites below 7: 4 and 6, so a(1) = 2.

Crossrefs

Cf. A000720, A062298, A065855, A092802, A092853, A092854.

Sequence in context: A057407 A286266 A193127 * A139738 A248343 A025608

Adjacent sequences: A092849 A092850 A092851 * A092853 A092854 A092855

Keyword

nonn

Author

Enoch Haga, Mar 07 2004

Extensions

a(9)-a(15) from Max Alekseyev, Aug 14 2013

a(16)-a(21) calculated using Kim Walisch's primecount and added by Amiram Eldar, Sep 05 2024

Status

approved