86009

Appears in sequences

• Consider sequence of fractions A066657/A066658 produced by ratios of terms in A066720; let m = smallest integer such that all fractions 1/n, 2/n, ..., (n-1)/n have appeared when we reach A066720(m) = k; sequence gives values of m; set a(n) = -1 if some fraction i/n never appears.at n=24A066849
• Consider sequence of fractions A066657/A066658 produced by ratios of terms in A066720; let m = smallest integer such that all fractions 1/n, 2/n, ..., (n-1)/n have appeared when we reach A066720(m) = k; sequence gives values of m; set a(n) = -1 if some fraction i/n never appears.at n=49A066849
• Number of admissible sequences of order j; related to 7x+1 problem.at n=8A174796
• Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-3,...,3}.at n=21A239553
• Number of compositions (ordered partitions) of n into distinct parts >= 3.at n=45A339101