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Revision History for A234306
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COMMENTS
Number of positive integers k <= n, such that k does not divide 2n-k. For example, a(12) = 5 since there are 5 positive integers k less than or equal to 12 that do not divide 2*12-k. They are 5, 7, 9, 10, and 11. - Wesley Ivan Hurt, Jun 24 2021
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LINKS
Muniru A Asiru, <a href="/A234306/b234306.txt">Table of n, a(n) for n = 1..5000</a>
PROG
(GAP) List([1..10^4], n->n+1-Tau(2*n)); # Muniru A Asiru, Feb 04 2018
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FORMULA
a(n) = sum_Sum_{i=1..n | i does not divide 2n-i} 1.
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reviewed
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