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A277645 Beatty sequence for 3+sqrt(6). 3
5, 10, 16, 21, 27, 32, 38, 43, 49, 54, 59, 65, 70, 76, 81, 87, 92, 98, 103, 108, 114, 119, 125, 130, 136, 141, 147, 152, 158, 163, 168, 174, 179, 185, 190, 196, 201, 207, 212, 217, 223, 228, 234, 239, 245, 250, 256, 261, 267, 272, 277, 283, 288, 294, 299, 305 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Eggleton et al. show that k is in this sequence if and only if A277515(k) > 3.

REFERENCES

R. B. Eggleton, J. S. Kimberley and J. A. MacDougall, Square-free rank of integers, submitted.

LINKS

Jason Kimberley, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = floor(n*(3+sqrt(6))).

a(n) = 3*n + A000196(A033581(n)).

a(n) = A008585(n) + A000196(A033581(n)).

EXAMPLE

a(4) = 3*4 + 9 because 9^2 = 81 < 6*4^2 = 96 < 100 = 10^2.

PROG

(MAGMA) [3*n+Isqrt(6*n^2): n in [1..60]];

CROSSREFS

Complement of A277644.

Sequence in context: A313894 A276853 A178181 * A075003 A313895 A313896

Adjacent sequences:  A277642 A277643 A277644 * A277646 A277647 A277648

KEYWORD

nonn,easy

AUTHOR

Jason Kimberley, Oct 26 2016

STATUS

approved

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Last modified October 22 04:25 EDT 2019. Contains 328315 sequences. (Running on oeis4.)