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A295562 List of numbers whose middle Fibonomial coefficient (2n,n)_F is prime to 105. 0

%I #15 Sep 29 2023 03:45:33

%S 1,1312,3256,3257,3936,3937,4000,4001,4032,38880,38881,39000,39001,

%T 19928280,19928281,21975136,21975137,21975305,21975312,22054032

%N List of numbers whose middle Fibonomial coefficient (2n,n)_F is prime to 105.

%C From _Charlie Neder_, Mar 04 2019: (Start)

%C For the middle Fibonomial coefficient (2n,n)_F to be coprime to a prime p, we must have that the integral part of n/A001177(p) has its base-p digits all < p/2 and its fractional part is < 1/2.

%C Next term > 10^8. (End)

%H Christian Ballot, <a href="https://www.fq.math.ca/Papers1/55-4/BallotLucasCatalan101717.pdf">Divisibility of the middle Lucasnomial coefficient</a>, Fib. Q., 55 (2017), 297-308.

%F Numbers k congruent to 0 or 1 modulo 8 such that floor(k/4) is in A005836, k is in A037543, and floor(k/8) is in A037461. - _Charlie Neder_, Mar 04 2019

%Y Cf. A003267, A030979.

%Y Cf. A037461, A037543, A005836.

%K nonn,more

%O 1,2

%A _N. J. A. Sloane_, Nov 28 2017

%E a(10)-a(20) from _Charlie Neder_, Mar 04 2019

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Last modified April 25 10:01 EDT 2024. Contains 371967 sequences. (Running on oeis4.)