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A327755 Odd integers n such that binomial(n-1,(n-1)/2) is coprime to n. 1

%I

%S 1,3,5,7,9,11,13,17,19,21,23,25,27,29,31,37,41,43,47,49,53,55,57,59,

%T 61,65,67,71,73,75,79,81,83,89,97,101,103,107,109,113,115,119,121,125,

%U 127,131,133,137,139,149,151,157,163,167,169,171,173,179,181,183,191,193,197,199,203,211,217,219,223,227,229,233,237,239,241,243,251,253,257,263,265,269,271,275,277,281,283,289,293,301,305,307,311,313,317,319

%N Odd integers n such that binomial(n-1,(n-1)/2) is coprime to n.

%C Integer n is in this sequence if for every prime p|n, the base-p representation of (n-1)/2 is composed of digits not exceeding (p-1)/2.

%C Contains every prime. Composite terms are listed in A327756.

%Y Cf. A327756.

%K nonn

%O 1,2

%A _Max Alekseyev_, Sep 24 2019

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Last modified October 5 08:41 EDT 2022. Contains 357252 sequences. (Running on oeis4.)