OFFSET
1
COMMENTS
See A187950.
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..10000
FORMULA
a(n)=[nr+5r]-[nr]-[5r], where r=sqrt(3).
MATHEMATICA
PROG
(Python)
from gmpy2 import isqrt
def A188090(n):
return int(isqrt(3*(n+5)**2)-isqrt(3*n**2)) - 8 # Chai Wah Wu, Oct 08 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Mar 20 2011
STATUS
approved