A087235 a(n) is the largest number in the set of solutions to n=x/pi(x), where pi(x)=A000720(x).

8, 33, 120, 360, 1134, 3094, 8472, 24300, 64720, 175197, 481452, 1304719, 3524654, 9560100, 25874784, 70119985, 189969354, 514278263, 1394199300, 3779856633, 10246936436, 27788573803, 75370126416, 204475055200, 554805820556, 1505578026105, 4086199303004, 11091501633037

Offset

2,1

Links

Giovanni Resta, Table of n, a(n) for n = 2..50

Robert T. Harger and William L. Hightower, An Interesting Property of x/π(x), The College Mathematics Journal Vol. 40, No. 3 (May 2009), pp. 213-214.

Formula

a(n) = Max{x; n*pi(x)=x}.

Example

n=22: list of solutions = {10246935644, 10246935842, 10246935864, 10246935974, 10246936106, 10246936128, 10246936370, 10246936436}, so a(22)=10246936436.

Crossrefs

Cf. A038623, A038624, A038625, A038626, A038627, A057809.

Sequence in context: A278670 A301771 A070051 * A222346 A317017 A283544

Adjacent sequences: A087232 A087233 A087234 * A087236 A087237 A087238

Keyword

nonn

Author

Labos Elemer, Sep 04 2003

Extensions

More terms from David Radcliffe, Sep 10 2014

a(29) corrected and a(30)-a(50) obtained from the values of A038625 computed by Jan Büthe. - Giovanni Resta, Sep 01 2018

Status

approved