21/02/19 00:25:00.67 45fvrIx7.net
>>77
第n項 = (n - m(m-1)/2) / m,
m = [ 1/2 + √(2n) ] … floor( )
21/02/19 00:25:00.67 45fvrIx7.net
>>77
第n項 = (n - m(m-1)/2) / m,
m = [ 1/2 + √(2n) ] … floor( )
21/02/19 00:25:00.67 45fvrIx7.net
>>77
第n項 = (n - m(m-1)/2) / m,
m = [ 1/2 + √(2n) ] … floor( )