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Search: id:A089695
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| A089695 |
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Numbers n such that placing as many possible '+' signs anywhere in between the digits yields a prime in every case. Let abcd... be the digits of n; then abcd, a+bcd, ab+cd, abc+d, a+b+cd, a+bc +d, ab+c+d, a+b+c+d, ... are all prime. |
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+0
2
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| 2, 3, 5, 7, 11, 23, 29, 41, 43, 47, 61, 67, 83, 89, 101, 227, 229, 281, 401, 443, 449, 467, 601, 607, 647, 661, 683, 809, 821, 863, 881, 4001, 4463, 4643, 6007, 6067, 6803, 8009
(list; graph; listen)
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