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A183856 n+floor(sqrt(3n-2)); complement of A143975. 1
2, 4, 5, 7, 8, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 102, 103, 104, 105, 106 (list; graph; refs; listen; history; text; internal format)
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

Cf. A000212, A143975.

Sequence in context: A092289 A079358 A184014 * A183869 A224731 A289036

Adjacent sequences:  A183853 A183854 A183855 * A183857 A183858 A183859

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jan 07 2011

STATUS

approved

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Last modified July 26 15:40 EDT 2021. Contains 346294 sequences. (Running on oeis4.)