login
A054002
Number of divisors of n such that n and n-1 have the same sum of divisors.
3
4, 6, 4, 8, 16, 8, 8, 12, 12, 8, 4, 10, 8, 4, 8, 12, 8, 16, 16, 16, 16, 8, 16, 12, 16, 16, 8, 8, 4, 16, 8, 24, 16, 4, 16, 8, 4, 32, 8, 16, 16, 16, 8, 8, 8, 8, 16, 32, 8, 8, 16, 16, 16, 12, 16, 16, 12, 8, 48, 32, 8, 24, 24, 16, 16, 16, 8, 16, 24, 64, 8, 16, 16, 16, 16, 64, 24, 32, 60
OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10135 (from the b-file at A002961)
FORMULA
a(n) = tau(A002961(n) + 1).
PROG
(Magma) [#Divisors(n):n in [2..3500000]| SumOfDivisors(n) eq SumOfDivisors(n-1)]; // Marius A. Burtea, Sep 07 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 12 2000
EXTENSIONS
More terms from Naohiro Nomoto, Jun 23 2001
STATUS
approved