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Search: id:A068533
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| A068533 |
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a(n)=(11^(2^n)-1)/2^(n+2)/15. |
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| 1, 61, 446581, 47864301941221, 1099675872153778794555007944901, 1160915542845287082257685451398396234242229540362376748831753861, 25876318034299537674318129223355111712986147880645111667280578830387708844445052\ 65048062877435638536484571643805442456022573810181
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