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A074819 Numbers n such that mu(n)+mu(n+1) = 0. 2
1, 5, 6, 8, 10, 13, 22, 24, 27, 37, 44, 46, 48, 49, 58, 61, 63, 65, 69, 73, 75, 77, 80, 82, 98, 99, 105, 106, 110, 114, 116, 120, 124, 125, 129, 135, 147, 152, 154, 157, 165, 166, 168, 171, 175, 178, 182, 185, 186, 188, 193, 194, 207, 210, 221, 224, 226, 237, 242 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A092410(a(n)) = 0. - Reinhard Zumkeller, Sep 04 2015

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Vaclav Kotesovec, Plot of a(n)/n for n = 1..1300000

FORMULA

a(n) seems to be asymptotic to c*n with c=3.7....

MATHEMATICA

Select[Range[1, 300], MoebiusMu[#] + MoebiusMu[#+1] == 0&] (* Vaclav Kotesovec, Feb 16 2019 *)

PROG

(Haskell)

a074819 n = a074819_list !! (n-1)

a074819_list = filter ((== 0) . a092410) [1..]

-- Reinhard Zumkeller, Sep 04 2015

CROSSREFS

Cf. A008683, A092410.

Sequence in context: A055592 A242731 A151976 * A113935 A279646 A291640

Adjacent sequences:  A074816 A074817 A074818 * A074820 A074821 A074822

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Sep 08 2002

STATUS

approved

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Last modified June 20 17:43 EDT 2019. Contains 324234 sequences. (Running on oeis4.)