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A110437 A weighted sum of Jacobi function values. 3


%S 1,11,111,1101,11111,111111,1101001,11111111,111111111,1101100101,

%T 11111111111,111101111011,1101101101101,11111111111111,

%U 111111111111111,1101101101001101,11110101101110011,111111111111111111

%N A weighted sum of Jacobi function values.

%C Can be regarded as base 2 version of A110436. It would appear that a(n) has all 1's whenever 2n+1 is prime.

%F a(n)=sum{k=0..n, abs(Jacobi(n-k, 2k+1))10^k}

%Y Cf. A005097.

%K easy,nonn

%O 1,2

%A _Paul Barry_, Jul 20 2005

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Last modified March 25 07:12 EDT 2019. Contains 321468 sequences. (Running on oeis4.)