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Place where n-th 1 occurs in A023133.
1

%I #13 Jun 27 2019 06:14:49

%S 1,5,12,22,35,51,70,92,118,147,179,214,252,293,337,385,436,490,547,

%T 607,670,736,806,879,955,1034,1116,1201,1289,1381,1476,1574,1675,1779,

%U 1886,1996,2110,2227,2347,2470,2596,2725,2857,2993,3132,3274

%N Place where n-th 1 occurs in A023133.

%e a(n) = 1 + Sum_{k=1..n-1} ceiling(r*k) where r=Pi. [_Benoit Cloitre_, Jan 24 2009]

%o (PARI) a(n)=1+sum(k=1,n-1,ceil(Pi*k)) \\ _Benoit Cloitre_, Jan 24 2009

%Y Cf. A023133.

%K nonn

%O 1,2

%A _Clark Kimberling_