OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..8304 (terms below 10^13, calculated from the b-file at A002961)
EXAMPLE
The divisors of 206 are 1, 2, 103, 206, so tau(206) = 4 and sigma(206) = 312; the divisors of 207 are 1, 3, 9, 23, 69, 207, so tau(207) = 6 and sigma(207) = 312. Hence, the integer 206 belongs to this sequence. - Bernard Schott, Oct 18 2019
MATHEMATICA
Select[Range[100000], DivisorSigma[0, #] != DivisorSigma[0, # + 1] && DivisorSigma[1, #] == DivisorSigma[1, # + 1] &] (* Jayanta Basu, Mar 20 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 12 2000
EXTENSIONS
More terms from Jud McCranie, Oct 15 2000
STATUS
approved