Get ready Part 15

Algebra Level 3

Let A ( n ) A(n) denote the number of sums of positive integers a 1 + a 2 + + a r a_1+a_2+\dots+a_r which add up to n n with a 1 > a 2 + a 3 ; a 2 > a 3 + a 4 ; ; a r 2 > a r 1 + a r ; a r 1 > a r a_1>a_2+a_3;a_2>a_3 +a_4;\dots;a_{r-2}>a_{r-1}+a_r;a_{r-1}>a_r .Let B ( n ) B(n) denote the number of b 1 + b 2 + + b s b_1+b_2+\dots+b_s which add up to n n , with

  • b 1 b 2 b s b_1 \ge b_2 \ge \dots \ge b_s ,

  • Each b i b_i is in the sequence 1 , 2 , 4 , , g j , 1,2,4,\dots,g_j,\dots defined by g 1 = 1 , g 2 = 2 g_1=1,g_2=2 , and g j = g j 1 + g j 2 + 1 g_j=g_{j-1}+g_{j-2}+1 , and

  • If b 1 = g k b_1=g_k then every element in { 1 , 2 , 4 , . . . , g k } \{1,2,4,...,g_k\} appears at least once as a b i b_i .

Is A ( n ) = B ( n ) A(n)=B(n) for each n 1 n \ge 1 ?

Yes No

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1 solution

Chino Jeng
Dec 17, 2018

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