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Revision History for A048050
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LINKS
Omar E. Pol, <a href="/A048050/a048050.jpg">Illustration of initial terms obtained geometrically</a>.
COMMENTS
Named after the Indian-American mathematician Sarvadaman D. S. Chowla (1907-1995). - Amiram Eldar, Mar 09 2024
LINKS
Abdur Rahman Nasir, <a href="https://archive.org/details/dli.calcutta.11605/page/140/mode/2up">On a certain arithmetic function</a>, Bull. Calcutta Math. Soc., Vol. 38 (1946), p. 140.
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NAME
Chowla's function: sum of divisors of n except for 1 and n.
FORMULA
a(n) = A001065(n) - 1, n > 1.
For n > 1: a(n) = Sum_{k=2..A000005(n)-1} A027750(n,k). - Reinhard Zumkeller, Feb 09 2013
a(n) = A000203(n) - n - 1, n > 1. - Wesley Ivan Hurt, Aug 22 2013
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