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A372848
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Taxicab numbers that are sandwiched between semiprimes.
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0
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4104, 171288, 1728216, 2864288, 2987712, 2991816, 3512808, 3551112, 9016488, 10424232, 12753160, 13825728, 14197248, 36047592, 43450344, 43699392, 49844032, 63057960, 72131904, 75550088, 85188096, 92384712, 107872128, 107919000, 110808000, 117258678, 119824488, 132678000
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OFFSET
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1,1
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COMMENTS
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All terms are even numbers.
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LINKS
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EXAMPLE
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4104 = 2^3 * 3^3 * 19 (between 4103 = 11 * 373 and 4105 = 5 * 821).
171288 = 2^3 * 3^3 * 13 * 61 (between 171287 = 157 * 1091 and 171289 = 103 * 1663).
1728216 = 2^3 * 3^5 * 7 * 127 (between 1728215 = 5 * 345643 and 1728217 = 617 * 2801).
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MATHEMATICA
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Select[Import["https://oeis.org/A001235/b001235.txt", "Table"][[;; , 2]], # < 1.5*10^8 && PrimeOmega[# + {-1, 1}] == {2, 2} &] (* Amiram Eldar, May 16 2024 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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