A391291 Decimal expansion of 380^(1/5).

3, 2, 8, 0, 6, 2, 5, 9, 7, 6, 0, 5, 0, 5, 7, 6, 9, 0, 5, 4, 3, 9, 9, 4, 6, 1, 2, 8, 6, 5, 1, 4, 1, 1, 5, 2, 5, 4, 3, 9, 6, 6, 2, 4, 8, 7, 9, 7, 7, 7, 7, 0, 1, 2, 6, 7, 9, 5, 0, 2, 5, 9, 7, 9, 0, 8, 5, 6, 4, 6, 4, 2, 4, 4, 3, 2, 5, 7, 6, 6, 6, 4, 1, 4, 1, 6, 2, 9, 9, 9, 3, 6, 9, 8, 4, 8, 7, 2, 8, 7

Offset

1,1

Comments

This constant gives a lower bound of lim_{k->oo} R(3,k)^(1/k), where R = A000791.

Links

Table of n, a(n) for n=1..100.

Anurag Bishnoi, Wouter Cames van Batenburg, and Ananthakrishnan Ravi, The chromatic number of finite projective spaces, arXiv:2512.01760 [math.CO], 2025. See p. 12.

Formula

Equals 2^(2/5)*95^(1/5) = A005533*A011180.

Example

3.280625976050576905439946128651411525439662...

Mathematica

RealDigits[380^(1/5), 10, 100][[1]]

Crossrefs

Cf. A000791, A005533, A011180.

Sequence in context: A358656 A021757 A143312 * A224234 A305368 A391293

Adjacent sequences: A391288 A391289 A391290 * A391292 A391293 A391294

Keyword

nonn,cons,easy

Author

Stefano Spezia, Dec 05 2025

Status

approved