1,3
Antisigma(n) = A024816(n) = sum of non-divisors of n.
See A239877 - values of n for which a(n) / n is integer.
Jaroslav Krizek, Table of n, a(n) for n = 1..1000
a(n) = Sum_{k = 1...n} antisigma(k) mod k = Sum_{k = 1...n} A229110(k).
a(n) = a(n-1) for numbers n from A159907 if there are no odd multiply perfect numbers (A007691).
(MAGMA)[&+[(k*(k+1)div 2 - SumOfDivisors (k)) mod k: k in [1..n]]: n in [1..1000]]
Cf. A024816, A229110, A239877.
Sequence in context: A034806 A226822 A034307 * A070828 A112988 A218706
Adjacent sequences: A239873 A239874 A239875 * A239877 A239878 A239879
nonn
Jaroslav Krizek, Mar 29 2014
approved