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

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

Offset: 0

Author

Arkadiusz Wesolowski, Sep 15 2012

Keywords

• nonn

Comments

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

Examples

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

Links

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

Crossrefs

Cf. A001620, A134716, A058210.

Programs

Magma

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

Mathematica

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