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Search: id:A072541
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| A072541 |
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List of pairs of numbers (k, k+4), where k-1 and k+3 are primes. |
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1
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| 4, 8, 8, 12, 14, 18, 20, 24, 38, 42, 44, 48, 68, 72, 80, 84, 98, 102, 104, 108, 110, 114, 128, 132, 164, 168, 194, 198, 224, 228, 230, 234, 278, 282, 308, 312, 314, 318, 350, 354, 380, 384, 398, 402, 440, 444, 458, 462, 464, 468, 488, 492, 500, 504, 614, 618
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The puzzle started with a(3): 8, 12, 14, 18, 20, 24, ?.
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REFERENCES
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Frankfurter Allgemeine Sonntagszeitung, Jul 28, 2002, "Koennen Sie folgen?", p. 56.
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FORMULA
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a(2*n-1) = A023200(n)+1, a(2*n) = A023200(n)+5, n>0.
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CROSSREFS
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Sequence in context: A029679 A141284 A145154 this_sequence A141719 A098352 A014198
Adjacent sequences: A072538 A072539 A072540 this_sequence A072542 A072543 A072544
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug = 04 2002
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