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A237990
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Numbers m such that the numbers of primes, even positive integers and odd positive integers less than or equal to m are all even.
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2
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4, 8, 16, 20, 40, 44, 56, 64, 72, 80, 92, 96, 108, 116, 120, 124, 132, 136, 140, 144, 148, 152, 156, 164, 176, 184, 188, 196, 200, 204, 208, 224, 232, 240, 252, 256, 264, 268, 272
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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a(n) == 0 (mod 4)
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EXAMPLE
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A tetrahedral die whose faces are marked with the numbers from 1 to 4 has an even number of sides marked with prime numbers, even integers and odd integers. Therefore, 4 is in the sequence.
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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