OFFSET
1,2
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
P. Erdős, On a problem of Chowla and some related problems, Proc. Cambridge Philos. Soc. 32 (1936), pp. 530-540.
FORMULA
Erdős proved that a(n) ~ n. - Charles R Greathouse IV, Dec 05 2012
MAPLE
with(numtheory): for n from 1 to 150 do if tau(n) <> tau(n-1) then printf(`%d, `, n) fi: od: # James A. Sellers, May 19 2003
MATHEMATICA
a083794[n_] :=
Prepend[Select[Range[1, n],
DivisorSigma[0, #] != DivisorSigma[0, # - 1] &], 1]; a083794[82] (* Michael De Vlieger, Dec 24 2014 *)
PROG
(PARI) is(n)=numdiv(n-1)!=numdiv(n)
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, May 07 2003
EXTENSIONS
More terms from James A. Sellers, May 19 2003
STATUS
approved