A216756 a(n) = floor(e^e^(n/e^gamma)).

2, 5, 21, 219, 12686, 15636041, 4101615513409, 12983864742986180266005, 588668718546098799238432431873920456606, 93859726557327916653208320240553220872245170780539985934198524439788

Offset

0,1

Comments

Assuming the Riemann hypothesis we have a(n) < A134716(n) for n >= 4.

Links

Table of n, a(n) for n=0..9.

Eric Weisstein's World of Mathematics, Robin's Theorem

Example

a(3) = 219 because exp(exp(n/exp(gamma))) = 219.0062568829....

Mathematica

Table[Floor[E^E^(n/E^EulerGamma)], {n, 0, 9}]

Prog

(Magma) [Floor(Exp(Exp(n/Exp(EulerGamma(RealField(100)))))) : n in [0..9]];

Crossrefs

Cf. A001620, A134716, A058210.

Sequence in context: A108021 A162437 A357871 * A007570 A173313 A210575

Adjacent sequences: A216753 A216754 A216755 * A216757 A216758 A216759

Keyword

nonn

Author

Arkadiusz Wesolowski, Sep 15 2012

Status

approved