A201643
John Leech's example of a set of eleven distinct odd numbers the sum of whose reciprocals is 1.
Original entry on oeis.org
3, 5, 7, 9, 15, 21, 27, 35, 63, 105, 135
Offset: 1
- R. K. Guy, Unsolved Problems in Number Theory (UPINT), Section D11.
A211134
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, 45, 105, 945
Offset: 1
- 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), pp. 2036-2046.
- Nechemia Burshtein, All the solutions of the equation Sum_{i=1..11} 1/x_i = 1 in distinct integers of the form x_i = 3^alpha 5^beta 7^gamma, Disc. Math. (2008) Vol. 308, No. 18, 4286-4292. MR2427761 (2009e:11061)
A211132
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, 45, 135, 315
Offset: 1
A211135
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, 11, 33, 35, 45, 55, 77, 105
Offset: 1
A211139
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, 19, 21, 35, 315, 325, 1425
Offset: 1
A211119
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, 35, 63, 75, 1575
Offset: 1
A211120
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, 35, 45, 175, 525
Offset: 1
A211121
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, 75, 135, 1575
Offset: 1
A211122
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, 35, 45, 225, 315
Offset: 1
A211123
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, 35, 63, 105, 225
Offset: 1
Showing 1-10 of 21 results.
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