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A214858 Natural numbers missing from A214857. 1
5, 8, 12, 15, 19, 22, 26, 29, 32, 36, 39, 43, 46, 49, 53, 56, 60, 63, 67, 70, 73, 77, 80, 84, 87, 90, 94, 97, 101, 104, 108, 111, 114, 118, 121, 125, 128, 131, 135, 138, 142, 145, 149, 152, 155, 159, 162, 166, 169, 172, 176, 179, 183, 186, 189, 193, 196, 200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..58.

FORMULA

a(n+1) - a(n) = 3 or 4.

MATHEMATICA

tri = Table[n (n + 1)/2, {n, 0, 1000}]; t = Table[Count[tri, _?(# <= n^2 &)], {n, 0, Sqrt[tri[[-1]]]}]; Complement[Range[t[[-1]]], t] (* T. D. Noe, Mar 11 2013 *)

CROSSREFS

Cf. A063957, A214857.

Sequence in context: A212452 A184915 A108173 * A186276 A047383 A322534

Adjacent sequences:  A214855 A214856 A214857 * A214859 A214860 A214861

KEYWORD

nonn,easy

AUTHOR

Philippe Deléham, Mar 09 2013

EXTENSIONS

Extended by T. D. Noe, Mar 11 2013

STATUS

approved

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Last modified February 17 15:19 EST 2019. Contains 320220 sequences. (Running on oeis4.)