A088847 a(n) = sigma(A087979(n))/phi(A087979(n)) or 0 if A087979(n) is not a balanced number.

1, 1, 3, 4, 4, 6, 6, 8, 9, 8, 10, 12, 12, 14, 15, 16, 16, 18, 18, 20, 21, 20, 22, 24, 25, 24, 27, 28, 28, 30, 30, 32, 33, 32, 35

Offset

1,3

Links

Table of n, a(n) for n=1..35.

Example

While A088830 includes special balanced numbers, A087979 does not include per definition. Nevertheless, it seems that A087979 consists only of balanced numbers. This is provable at least for special cases.

Crossrefs

Cf. A000010, A000203, A087979, A020492 (balanced numbers), A088830.

Sequence in context: A014683 A213222 A166737 * A120613 A277193 A240728

Adjacent sequences: A088844 A088845 A088846 * A088848 A088849 A088850

Keyword

nonn,more

Author

Labos Elemer, Nov 17 2003

Extensions

a(24)-a(35) from Amiram Eldar, Dec 05 2019 (calculated from the data at A087979)

Status

approved