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A053224
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n for which sigma(n) < sigma(n+1).
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15
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1, 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 47, 49, 51, 53, 55, 57, 59, 61, 62, 63, 65, 67, 69, 71, 73, 74, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 107, 109, 111, 113, 115, 119, 121, 123, 125, 127, 129, 131
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MAPLE
| with (numtheory): seq( `if`((sigma(i) < sigma(i+1)), i, print( )), i=1..134);
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MATHEMATICA
| Select[Range[150], DivisorSigma[1, #] < DivisorSigma[1, # + 1] &] (* Carl Najafi, Aug 16 2011 *)
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CROSSREFS
| Cf. A000203, A053222, A053226, A053230.
Sequence in context: A153809 A004274 A004280 * A091377 A005357 A092919
Adjacent sequences: A053221 A053222 A053223 * A053225 A053226 A053227
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KEYWORD
| nonn
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AUTHOR
| Asher Auel (asher.auel(AT)reed.edu) Jan 06 2000
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