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A183219 Complement of the heptagonal (7-gonal) numbers. 2


%S 2,3,4,5,6,8,9,10,11,12,13,14,15,16,17,19,20,21,22,23,24,25,26,27,28,

%T 29,30,31,32,33,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,

%U 53,54,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106

%N Complement of the heptagonal (7-gonal) numbers.

%F n+Floor[1/2+(2n/5)^(1/2)].

%e 7-gonal numbers: (1,7,18,34,55,...)=A000566, so that

%e A183219=(2,3,4,5,6,8,9,...17,19,...33,35,...).

%t Table[n+Floor[1/2+(2n/5)^(1/2)], {n,100}]

%Y Cf. A000566.

%K nonn

%O 1,1

%A _Clark Kimberling_, Jan 01 2011

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Last modified May 6 21:21 EDT 2021. Contains 343587 sequences. (Running on oeis4.)