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A054027 Numbers n such that sum of divisors of n is not divisible by n. 2
2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

MAPLE

with(numtheory): [seq(`if`(sigma(i) mod i <> 0, i, print( )), i=1..90)];

CROSSREFS

Complement of A007691. Cf. A000203, A054024.

Sequence in context: A129487 A097010 A132999 * A080907 A127161 A129657

Adjacent sequences:  A054024 A054025 A054026 * A054028 A054029 A054030

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 23:04 EST 2012. Contains 205686 sequences.