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A273165 One half the number of divisors of nonprime numbers that are 3 (mod 4). 1

%I #5 Aug 03 2016 09:02:21

%S 2,2,2,2,2,2,3,3,2,2,2,3,2,2,2,2,4,2,3,2,2,3,3,2,2,4,4,4,4,4,4,4,4,4,

%T 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,

%U 4,4

%N One half the number of divisors of nonprime numbers that are 3 (mod 4).

%C Row length numbers of A273164.

%C With the Jan 05 2004 Jovovic comment on A078703 a(n) is also the number of divisors +1 as well as -1 (mod 4) of A091236(n). See the example section of A273164.

%F a(n) = number of divisors of A091236(n)(nonprime numbers 3 (mod 4)).

%Y Cf. A078703, A091236, A273164.

%K nonn,easy

%O 1,1

%A _Wolfdieter Lang_, Jul 29 2016

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