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Search: id:A147549
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| A147549 |
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a(n) is the number of n-digit numbers m such that phi(m)=phi(10^n+1), gcd(10^n+1,m)=1 & 10 doesn't divide m. |
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3
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| 0, 0, 3, 1, 3, 4, 11, 17, 116, 25, 222, 1806, 54, 223
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