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A054022 Chowla function of n is divisible by the number of divisors of n. 3
1, 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 23, 27, 29, 31, 32, 35, 36, 37, 39, 41, 43, 47, 50, 51, 53, 55, 59, 61, 67, 71, 73, 75, 79, 83, 87, 89, 91, 95, 97, 98, 101, 103, 107, 109, 111, 113, 115, 119, 123, 127, 131, 135, 137, 139, 143, 149, 151, 155, 157, 159, 162, 163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Chowla's function (A048050) = sum of divisors of n except 1 and n.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MAPLE

with(numtheory):

[seq(`if`((sigma(i)-i-1) mod tau(i)=0, i, print( )), i=1..1000)];

MATHEMATICA

Select[Range[200], Divisible[DivisorSigma[1, #]-1-#, DivisorSigma[0, #]]&] (* Harvey P. Dale, Mar 11 2012 *)

CROSSREFS

Complement is A054023 Cf. A000005, A048050, A054014.

Sequence in context: A082664 A342008 A095737 * A185603 A046654 A280724

Adjacent sequences:  A054019 A054020 A054021 * A054023 A054024 A054025

KEYWORD

nonn

AUTHOR

Asher Auel (asher.auel(AT)reed.edu), Jan 19 2000

STATUS

approved

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Last modified October 18 01:39 EDT 2021. Contains 348065 sequences. (Running on oeis4.)