A211126
One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 25, 27, 105, 135, 225
Offset: 1
A211127
One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 25, 27, 53, 225, 945
Offset: 1
A211128
One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 25, 27, 49, 1225, 6615
Offset: 1
A211129
One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 25, 27, 49, 1323, 4725
Offset: 1
A211130
One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 25, 27, 63, 189, 4725
Offset: 1
A211131
One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 27, 35, 49, 81, 19845
Offset: 1
A211136
One of 15 possible sets of eleven odd numbers, not all of the form 3^alpha 5^beta 7^gamma, whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 13, 15, 25, 75, 105, 315, 325
Offset: 1
A211137
One of 15 possible sets of eleven odd numbers, not all of the form 3^alpha 5^beta 7^gamma, whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 23, 45, 69, 105, 115
Offset: 1
A211138
One of 15 possible sets of eleven odd numbers, not all of the form 3^alpha 5^beta 7^gamma, whose sum of reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 11, 19, 33, 45, 75, 385, 1425
Offset: 1
A240132
Number of solutions of 1/x_1 + 1/x_2 + ... + 1/x_{2n-1} = 1 in distinct odd numbers > 1.
Original entry on oeis.org
0, 0, 0, 0, 5, 379118
Offset: 1
If 1 < x_1 < x_2 < x_3 are odd, then 1/x_1 + 1/x_2 + 1/x_3 < 3/3 = 1, so a(2) = 0.
- R. Arce-Nazario, F. Castro, and R. Figueroa, On the number of solutions of Sum_{i = 1..11} 1/x_i = 1 in distinct odd natural numbers, J. Number Theory, 133 (2013), 2036-2046.
- C. Elsholtz, Review of ``On the number of solutions of sum_{i = 1..11} 1/x_i = 1 in distinct odd natural numbers'' by R. Arce-Nazario, F. Castro, and R. Figueroa, zbMATH 1270.11033.
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