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⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

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Showing entries 1-10 | older changes
a(n) = Sum_{d|n} phi(d) * A003961(n/d), where A003961 shifts the prime factorization of its argument one step towards larger primes, and phi is Euler totient function.
#19 by Michel Marcus at Sat Sep 16 05:25:40 EDT 2023
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#18 by Joerg Arndt at Sat Sep 16 04:40:21 EDT 2023
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#17 by Amiram Eldar at Sat Sep 16 04:12:43 EDT 2023
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#16 by Amiram Eldar at Sat Sep 16 03:04:21 EDT 2023
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#15 by Amiram Eldar at Mon Oct 18 14:14:37 EDT 2021
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#14 by Antti Karttunen at Sat Oct 16 14:26:19 EDT 2021
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#13 by Antti Karttunen at Sat Oct 16 04:52:29 EDT 2021
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#12 by Susanna Cuyler at Tue Aug 24 21:08:56 EDT 2021
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#11 by Antti Karttunen at Tue Aug 24 15:58:31 EDT 2021
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#10 by Antti Karttunen at Tue Aug 24 13:12:26 EDT 2021
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