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Table of n, a(n) for n=1..105.
Conjecture : (1/n)*sum(k=1, n, a(k)) = C*ln(ln(n))+o(ln(ln(n)) with 1<C<3/2
(PARI) for(n=1, 150, print1(sum(i=1, n, if((n^3+1)%(i^3+1), 0, 1)), ", "))
Sequence in context: A206778 A101872 A174892 * A101312 A241273 A154263
Adjacent sequences: A069926 A069927 A069928 * A069930 A069931 A069932
Benoit Cloitre, May 05 2002