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A146295
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Integers which are not the sum of a 4-almost prime and a prime.
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4
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2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 22, 24, 25, 28, 30, 32, 34, 36, 40, 44, 46, 48, 50, 52, 54, 60, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 96, 108, 114, 116, 120, 126, 130, 132, 136, 144, 150, 156, 162, 168, 174, 180, 204, 210, 216, 240, 246, 258
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OFFSET
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2,1
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COMMENTS
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Largest term is 60060 (see b-file). No more terms < 10^8. Conjectured to be complete.
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LINKS
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EXAMPLE
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20 is in this sequence because no 4-almost prime and a prime sum to 20. 21 is not in this sequence because the sum of 16 (4-almost prime) and 5 (prime) is 21.
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MATHEMATICA
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Complement[Range[1000], Union@Flatten@Outer[Plus, Select[Range[1000], PrimeOmega[#] == 4 &], Prime[Range[PrimePi[1000]]]]] (* Robert Price, Jun 16 2019 *)
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CROSSREFS
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KEYWORD
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fini,nonn
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AUTHOR
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STATUS
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approved
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