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A054006 Number of divisors of k and k+1 which have the same number and sum of divisors. 4
4, 8, 8, 8, 8, 8, 16, 16, 16, 8, 16, 16, 16, 16, 16, 16, 16, 16, 32, 16, 16, 16, 16, 32, 16, 16, 16, 24, 16, 16, 16, 32, 32, 32, 16, 16, 32, 16, 32, 16, 16, 32, 32, 16, 32, 16, 16, 16, 16, 16, 32, 32, 16, 32, 16, 16, 64, 32, 16, 32, 16, 32, 16, 64, 32, 32, 16, 32, 32, 32, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..1831 (calculated using the b-file at A054004)
FORMULA
a(n) = tau(A054004(n)).
EXAMPLE
See example in A054004.
MATHEMATICA
Select[Partition[Array[DivisorSigma[{0, 1}, #] &, 10^6], 2, 1], SameQ @@ # &][[All, 1, 1]] (* Michael De Vlieger, Nov 21 2019 *)
CROSSREFS
Sequence in context: A201405 A331067 A040012 * A029679 A304651 A187768
KEYWORD
nonn
AUTHOR
Asher Auel, Jan 12 2000
EXTENSIONS
More terms from Jud McCranie, Oct 15 2000
STATUS
approved

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Last modified July 15 15:53 EDT 2024. Contains 374333 sequences. (Running on oeis4.)