OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Harvey P. Dale)
FORMULA
a(n) = (A066692(n) + 1)/2. - Michel Marcus, Jan 04 2016
MATHEMATICA
nn=250; With[{tau=DivisorSigma[0, Range[2nn+1]]}, Select[Range[nn], tau[[2#-1]] == tau[[2#+1]]&]] (* Harvey P. Dale, May 19 2012 *)
PROG
(Magma) [n: n in [1..300] | NumberOfDivisors(2*n-1) eq NumberOfDivisors(2*n+1)]; // Vincenzo Librandi, Jan 03 2016
(PARI) isok(n) = numdiv(2*n-1)==numdiv(2*n+1); \\ Michel Marcus, Jan 04 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, May 07 2011
EXTENSIONS
Corrected by Harvey P. Dale, May 19 2012
STATUS
approved