Talk:Rare numbers: Difference between revisions
→21+ digit rare numbers: sorted results, removed dups
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There only seem to be 5 21 digit rare numbers, so I started looking at 22 digits. I found that each odd number of digits takes less time (about 80% of the time) of the previous even number of digits, but each even/odd pair (number of digits such as 16/17 vs 14/15) takes about 20 times a long as the previous pair, so the computation time increases dramatically for results above 19 digits. Here are a few found so far:
<pre style="height:50ex;overflow:scroll"> 90:
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100th (2,939,501,759,705,522,349,392)▼
101th (2,939,503,537,707,740,349,392)▼
102th (2,939,503,375,709,360,349,392)▼
103:
105: 2,788,047,668,617,596,408,872
106: 2,788,047,848,617,776,408,872
107: 2,788,047,868,437,576,408,872
108: 2,788,047,888,617,376,408,872
▲ 108th (2,622,937,641,933,274,481,162)
▲ 109th (2,622,955,841,933,256,281,162)
▲ 111th (2,622,957,843,751,254,281,162)
112: 2,939,521,359,525,562,149,392
112th (6,344,828,989,519,887,483,525)▼
113: 2,939,521,557,527,542,149,392
114: 2,939,523,577,527,340,149,392
115: 2,939,523,779,525,320,149,392
116:
▲ 119th (2,747,736,918,335,953,517,072)
120: 8,655,059,576,513,659,814,468
▲ 122nd (8,045,841,654,642,561,594,308)
121: 8,655,059,772,157,639,814,468
▲ 123rd (8,045,841,652,464,561,594,308)
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:Now that you've established that there are five 21 digit rare numbers, it might be worth mailing SSG (at guptass@rediffmail.com) to see if he'll add them to his list.
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