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A015945 Positive integers n such that n | (2^n + n/2 + 1). 2

%I

%S 2,10,50,250,410,1250,2050,5050,6250,10250,16810,25250,31250,51250,

%T 84050,126250,156250,207050,256250,336610,405050,420250,510050,631250,

%U 689210,781250,1035250,1281250,1683050,1750250,2025250,2101250,2550250,3156250,3446050

%N Positive integers n such that n | (2^n + n/2 + 1).

%F a(n) = 2 * A015950(n). - _Max Alekseyev_, Aug 04 2011

%o (Python)

%o A015945_list = [n for n in range(2,10**6,2) if pow(2,n,n) == n//2-1] # _Chai Wah Wu_, Mar 25 2021

%K nonn

%O 1,1

%A _Robert G. Wilson v_

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Last modified April 10 14:07 EDT 2021. Contains 342845 sequences. (Running on oeis4.)