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A054012 Nonzero values of n read modulo (number of proper divisors of n). 1
2, 1, 1, 2, 2, 3, 1, 3, 1, 2, 3, 2, 2, 1, 2, 4, 2, 5, 4, 1, 3, 1, 2, 5, 1, 1, 5, 2, 3, 4, 2, 3, 3, 6, 2, 1, 2, 1, 8, 1, 1, 7, 1, 2, 4, 2, 1, 2, 1, 2, 8, 3, 4, 4, 4, 6, 1, 9, 5, 4, 2, 1, 1, 2, 1, 2, 1, 2, 4, 2, 5, 2, 4, 1, 2, 2, 3, 5, 8, 1, 2, 4, 1, 2, 2, 3, 7, 5, 3, 2, 2, 2, 6, 2, 4, 4, 1, 3, 1, 2, 1, 2, 6, 5, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..105.

FORMULA

a(n) = A054011(A054009(n))

MAPLE

with(numtheory):

[seq(`if`(i mod (tau(i)-1) <> 0, i mod (tau(i)-1), print( )), i=2..220)];

MATHEMATICA

Cases[Table[Mod[n, DivisorSigma[0, n]-1], {n, 2, 200}], Except[0]] (* Harvey P. Dale, Nov 12 2011 *)

CROSSREFS

Cf. A000005, A032741, A054009, A054011.

Sequence in context: A325055 A325526 A057820 * A062083 A133114 A156265

Adjacent sequences:  A054009 A054010 A054011 * A054013 A054014 A054015

KEYWORD

nonn

AUTHOR

Asher Auel (asher.auel(AT)reed.edu) Jan 17, 2000

STATUS

approved

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Last modified October 19 11:26 EDT 2019. Contains 328216 sequences. (Running on oeis4.)