160327(2)

Ruby


逆数の和が1 であるような互いに異なる奇数の集合(2)

オンライン整数列大辞典から探してきたものを追加した。

[[3, 5, 7, 9, 15, 21, 27, 35, 63, 105, 135], # A201643
 [3, 5, 7, 9, 11, 15, 35, 45, 231], # A201644
 [3, 5, 7, 9, 11, 15, 21, 135, 10395], # A201646 
 [3, 5, 7, 9, 11, 15, 21, 165, 693], # A201647
 [3, 5, 7, 9, 11, 15, 21, 231, 315], # A201648
 [3, 5, 7, 9, 11, 15, 33, 45, 385], # A201649
 [3, 5, 7, 9, 11, 33, 35, 45, 55, 77, 105], #A238795
 [3, 5, 7, 9, 11, 13, 23, 721, 979011, 175878510309, 20622166925499467673345], #A239036
 [3, 5, 7, 9, 11, 13, 23, 721, 979007, 661211444787, 622321538786143185105739,
  511768271877666618502328764212401495966764795565,
  209525411280522638000804396401925664136495425904830384693383280180439963265695525939102230139815] # A130738
].each{|a|
  p [a, a.inject(0){|s, i| s + 1r / i}, a.inject(:+)]
}

出力結果
[[3, 5, 7, 9, 15, 21, 27, 35, 63, 105, 135], (1/1), 425]
[[3, 5, 7, 9, 11, 15, 35, 45, 231], (1/1), 361]
[[3, 5, 7, 9, 11, 15, 21, 135, 10395], (1/1), 10601]
[[3, 5, 7, 9, 11, 15, 21, 165, 693], (1/1), 929]
[[3, 5, 7, 9, 11, 15, 21, 231, 315], (1/1), 617]
[[3, 5, 7, 9, 11, 15, 33, 45, 385], (1/1), 513]
[[3, 5, 7, 9, 11, 33, 35, 45, 55, 77, 105], (1/1), 385]
[[3, 5, 7, 9, 11, 13, 23, 721, 979011, 175878510309, 20622166925499467673345], (1/1), 20622166925675347163457]
[[3, 5, 7, 9, 11, 13, 23, 721, 979007, 661211444787, 622321538786143185105739, 511768271877666618502328764212401495966764795565, 209525411280522638000804396401925664136495425904830384693383280180439963265695525939102230139815], (1/1), 209525411280522638000804396401925664136495425905342152965260946798942292652229466221873392465705]