LINKS
Max Alekseyev, <a href="/A102146/b102146_1.txt">Table of n, a(n) for n = 1..352</a> (terms 1..322 from Ray Chandler)
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Max Alekseyev, <a href="/A102146/b102146_1.txt">Table of n, a(n) for n = 1..352</a> (terms 1..322 from Ray Chandler)
editing
approved
Max Alekseyev, <a href="/A102146/b102146_1.txt">Table of n, a(n) for n = 1..352</a> (terms 1..322 from Ray Chandler)
Cf. A000203, A001270, A002283, A003020, A005422, A046053, A046107, A046412, A046415, A046416, A046417, A046418, A046419, A046420, A057951, A059892, A061075, A070528, A070529, A081317, A081318, A085035, A095370, A095413, A095414, A095417, A095418, A102347, A102380, A112505, A147556, A295503, A366669.
Ray Chandler, Max Alekseyev, <a href="/A102146/b102146_1.txt">Table of n, a(n) for n = 1..322352</a>
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C. Caldwell, <a href="httphttps://primes.utmt5k.eduorg/glossary/page.php?sort=SigmaFunction
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Sigmaa(n) = sigma(10^n - 1), where sigma(n) is the sum of positive divisors of n.
(PARI) a(n) = sigma(10^n-1); \\ Michel Marcus, Apr 22 2017
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a(n) = A000203(A002283(n)). - Ray Chandler, Apr 22 2017