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Search: id:A085434
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| A085434 |
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n-th even number not a power of 2 whose largest and smallest factors do not add or subtract to a twin prime. |
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+0
2
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| 46, 74, 94, 106, 134, 158, 166, 178, 194, 226, 254, 262, 314, 326, 334, 346, 422, 446, 466, 502, 514, 526, 554, 586, 614, 634, 662, 674, 706, 718, 734, 746, 758, 766, 778, 794, 802, 818, 878, 886, 898, 914, 934, 958, 974, 982, 998, 1006, 1018, 1082, 1094
(list; graph; listen)
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OFFSET
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6,1
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COMMENT
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The density of these numbers approach 0 as n approaches oo.
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PROGRAM
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(PARI) maxpmmintwin(n) = { c=0; forprime(p=3, n, if(!isprime(p-2) & !isprime(p+2), print1(p+p", "); c++); ); print(); print(c" "c/n+.0) }
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CROSSREFS
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Cf. A052369, A056608.
Sequence in context: A101577 A051413 A167283 this_sequence A020351 A113691 A057454
Adjacent sequences: A085431 A085432 A085433 this_sequence A085435 A085436 A085437
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Aug 13 2003
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