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A349869 Nobly deficient numbers (A349759) that are not deficient numbers (A005100). 2
36, 48, 100, 112, 144, 162, 192, 196, 208, 324, 400, 448, 576, 784, 832, 900, 1296, 1458, 1600, 1764, 1936, 1984, 2304, 2368, 2500, 2704, 2752, 2916, 3072, 3136, 3600, 3904, 4288, 4356, 4624, 4672, 4900, 5184, 5776, 6084, 6208, 6400, 6976, 7056, 7168, 7744, 8100 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
36 is a term since it is not deficient, A000203(36) = 91 > 2*36 = 72, and both A000005(36) = 9 and A000203(36) = 91 are deficient.
MATHEMATICA
defQ[n_] := DivisorSigma[1, n] < 2*n; nobDefQ[n_] := And @@ defQ /@ DivisorSigma[{0, 1}, n]; Select[Range[10^4], !defQ[#] && nobDefQ[#] &]
CROSSREFS
Intersection of A023196 and A349759.
Sequence in context: A357606 A348274 A033701 * A260920 A132956 A260015
KEYWORD
nonn
AUTHOR
Amiram Eldar, Dec 03 2021
STATUS
approved

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Last modified April 23 01:11 EDT 2024. Contains 371906 sequences. (Running on oeis4.)