OFFSET
1,3
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = gcd(sigma(n+1)-(n+1)-1, sigma(n)-n-1), for n > 1.
EXAMPLE
Chowla's function values from 92 to 96 are 75,34,49,24,155: successive values are relatively primes.
MATHEMATICA
m = 100; s = Array[If[# == 1, 0, DivisorSigma[1, #] - # - 1] &, {m}]; GCD[s[[1 ;; m - 1]], s[[2 ;; m]]] (* Amiram Eldar, Aug 28 2019 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Labos Elemer, Apr 10 2002
EXTENSIONS
a(1) corrected by Amiram Eldar, Aug 28 2019
STATUS
approved