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J palindromes
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| range =: 100 }. i. 1000 | |
| uniq_prods =: ~. @: , @: (*/~) | |
| palindrome =: (-: |."1) @ (":"0) | |
| >./ (#~ palindrome) uniq_prods range | |
| >./ ( palindrome # ] ) ~. , */~ range | |
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| t =: ... | |
| table =: 20 20 $ t | |
| transposed =: > table ; (|: table) ; ([ /. table) ; ([ /. |. table) | |
| cycles =: 0 ,"1 (0 ,"0 i. 20) | |
| foursomes =: 4 {."1 cycles |. transposed | |
| >./ , */"1 foursomes | |
| Or better | |
| table =: 20 20 $ ... | |
| transposed =: (] ` |: ` ([ /.) ` ([ /.@|.)) `:0 table | |
| >./ , 4 */\"1 transposed |
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