OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
FORMULA
a(n+1) - a(n) = 2 if n is in A000212, 1 otherwise. - Robert Israel, Jun 04 2019
MAPLE
seq(seq(i+k, i=ceil((k^2+2)/3) .. ((k+1)^2+1)/3), k=1..10); # Robert Israel, Jun 04 2019
MATHEMATICA
Array[#+Floor[Sqrt[3#-2]]&, 100] (* Harvey P. Dale, Mar 15 2013 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 07 2011
STATUS
approved