Proper divisors: Difference between revisions
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10 1, 2, 5 |
10 1, 2, 5 |
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The number up to 20,000 with the most divisors was 15120 with 79 divisors.</pre> |
The number up to 20,000 with the most divisors was 15120 with 79 divisors.</pre> |
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=={{header|Forth}}== |
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{{works with|gforth|0.7.3}} |
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<lang forth>: .proper-divisors |
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dup 1 ?do |
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dup i mod 0= if i . then |
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loop cr drop |
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; |
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: proper-divisors-count |
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0 swap |
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dup 1 ?do |
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dup i mod 0= if swap 1 + swap then |
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loop drop |
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; |
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: rosetta-proper-divisors |
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cr |
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11 1 do |
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i . ." : " i .proper-divisors |
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loop |
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1 0 |
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20000 2 do |
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i proper-divisors-count |
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2dup < if nip nip i swap else drop then |
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loop |
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swap cr . ." has " . ." divisors" cr |
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; |
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rosetta-proper-divisors</lang> |
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{{out}} |
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<pre>1 : |
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2 : 1 |
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3 : 1 |
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4 : 1 2 |
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5 : 1 |
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6 : 1 2 3 |
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7 : 1 |
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8 : 1 2 4 |
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9 : 1 3 |
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10 : 1 2 5 |
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15120 has 79 divisors |
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ok</pre> |
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=={{header|Fortran}}== |
=={{header|Fortran}}== |
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