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A214858 Natural numbers missing from A214857. 1

%I

%S 5,8,12,15,19,22,26,29,32,36,39,43,46,49,53,56,60,63,67,70,73,77,80,

%T 84,87,90,94,97,101,104,108,111,114,118,121,125,128,131,135,138,142,

%U 145,149,152,155,159,162,166,169,172,176,179,183,186,189,193,196,200

%N Natural numbers missing from A214857.

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

%t 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 *)

%Y Cf. A063957, A214857.

%K nonn,easy

%O 1,1

%A _Philippe Deléham_, Mar 09 2013

%E Extended by _T. D. Noe_, Mar 11 2013

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)