A080848 a(n) = n*(mu(n)+2), where mu is the Moebius function (A008683).

3, 2, 3, 8, 5, 18, 7, 16, 18, 30, 11, 24, 13, 42, 45, 32, 17, 36, 19, 40, 63, 66, 23, 48, 50, 78, 54, 56, 29, 30, 31, 64, 99, 102, 105, 72, 37, 114, 117, 80, 41, 42, 43, 88, 90, 138, 47, 96, 98, 100, 153, 104, 53, 108, 165, 112, 171, 174, 59, 120, 61, 186, 126, 128, 195, 66

Offset

1,1

Comments

n <= a(n) <= 3*n.

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Prog

(Scheme) (define (A080848 n) (* n (+ 2 (A008683 n)))) ;; Antti Karttunen, Jul 26 2017

Crossrefs

Cf. A008683, A080847, A080849.

Sequence in context: A187153 A213265 A123649 * A016602 A131134 A151690

Adjacent sequences: A080845 A080846 A080847 * A080849 A080850 A080851

Keyword

nonn

Author

Reinhard Zumkeller, Feb 20 2003

Status

approved