Search: id:A051464
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%I A051464
%S A051464 2,2,2,2,4,4,2,2,4,2,4,2,4,6,4,4,16,2,4,2,4,2,4,8,12,8,2,4,8,4,4,4,4,4,
%T A051464 4,8,8,4,8,16,8,4,8,8,6,16,8,8,8,16,8,4,32,32,8,4,8,4,4,8,16,8,8,16,48,
%U A051464 16,16,8,4,16,4,16,16,8,8,8,16,16,8,16,16,8,16,8,48,192,8,8,16,4,8,2
%N A051464 Number of divisors of 4*(2^n-1) + 1.
%C A051464 Create a table with tau(2^n-1) as the first row (A046801) and tau(m) 
               as the first column (A000005). The second column is tau(A004760) 
               and so on. Rows 2, 3 and 4 are easily described in terms of row 1. 
               This sequence is row 5.
%F A051464 a[ n ] = DivisorSigma [ 0, 4*(2^n -1)+1 ] ]
%Y A051464 Sequence in context: A155904 A125913 A122386 this_sequence A060632 A151565 
               A160407
%Y A051464 Adjacent sequences: A051461 A051462 A051463 this_sequence A051465 A051466 
               A051467
%K A051464 nonn
%O A051464 1,1
%A A051464 Edwin D. Evans, eevans2(AT)pacbell.net

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