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%I #7 Dec 07 2017 04:04:59
%S 17,37,56,76,95,115,136,154,175,194,214,234,254,273,293,313,332,352,
%T 372,392,411,432,450,471,490,511,529,550,569,590,608,629,648,668,688,
%U 708,727,747,767,786,806,826,846,865,885
%N Number of points of the outer discrete Theodorus spiral on sheet S_n, n >= 1. First differences of A072895.
%C The punctured sheets S_n start here with n=1: S_n := rho*exp(i*phi), rho > 0, 2*Pi*(n-1) <= phi < 2*Pi*n.
%C For details and references see A072895.
%F a(n) = b(n+1) - b(n), n >= 1, with b(n) = A072895(n), and a(1) = 17.
%Y Cf. A072895.
%K nonn
%O 1,1
%A _Wolfdieter Lang_, Dec 01 2017