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A292996 Index of first nonintegral term in the sequence b(1)=2, b(k)=b(k-1)*(b(k-1)+k-1+n)/k (k>=2). 1

%I #7 Sep 27 2017 21:58:14

%S 43,3,7,5,3,7,59,3,5,7,3,23,7,3,19,17,3,73,5,3,19,13,3,5,17,3,7,17,3,

%T 59,7,3,17,5,3,43,17,3,5,19,3,17,29,3,7,11,3,7,5,3,31,7,3,5,7,3,11,23,

%U 3,83,13,3,41,5,3,7,17,3,5,47,3,19,7,3,23,7,3,19,5,3,23,31,3,5,43,3,7,17,3,7,19,3,17,5,3,17,7,3,5,13,3,93

%N Index of first nonintegral term in the sequence b(1)=2, b(k)=b(k-1)*(b(k-1)+k-1+n)/k (k>=2).

%C a(0)=A097398(1,2)=43 corresponds to Goebel's sequence A003504.

%C First composite term is a(101)=93.

%H Max Alekseyev, <a href="/A292996/b292996.txt">Table of n, a(n) for n = 0..10000</a>

%H M. Alekseyev, <a href="https://mathoverflow.net/q/282154">Simple recurrence that fails to be integer for the first time at the 44th term</a>, Mathoverflow, 2017.

%Y Cf. A003504, A097398.

%K nonn

%O 0,1

%A _Max Alekseyev_, Sep 27 2017

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