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A069896 GCD of consecutive values of Chowla-function. 1
1, 0, 2, 2, 5, 5, 6, 3, 1, 7, 15, 15, 9, 1, 2, 14, 20, 20, 21, 1, 1, 13, 35, 5, 5, 3, 3, 27, 41, 41, 30, 2, 1, 1, 6, 54, 21, 1, 1, 49, 53, 53, 39, 1, 1, 25, 75, 1, 7, 2, 5, 45, 65, 1, 1, 1, 1, 31, 107, 107, 33, 1, 2, 2, 1, 77, 57, 1, 1, 73, 122, 122, 39, 3, 3, 9, 1, 89, 105, 3, 1, 43 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

FORMULA

a(n)=GCD[sigma(n+1)-(n+1)-1, sigma(n)-n-1]

EXAMPLE

Chowla-function values from 92 to 96 are 75,34,49,24,155: successive values are relatively primes.

CROSSREFS

Cf. A048050, A000203, A001650.

Sequence in context: A172417 A158106 A185313 * A053246 A168391 A157123

Adjacent sequences:  A069893 A069894 A069895 * A069897 A069898 A069899

KEYWORD

easy,nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Apr 10 2002

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.