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A085434 n-th even number not a power of 2 whose largest and smallest factors do not add or subtract to a twin prime. 1

%I #4 Oct 01 2013 17:57:39

%S 46,74,94,106,134,158,166,178,194,226,254,262,314,326,334,346,422,446,

%T 466,502,514,526,554,586,614,634,662,674,706,718,734,746,758,766,778,

%U 794,802,818,878,886,898,914,934,958,974,982,998,1006,1018,1082,1094

%N n-th even number not a power of 2 whose largest and smallest factors do not add or subtract to a twin prime.

%C The density of these numbers approach 0 as n approaches oo.

%o (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) }

%Y Cf. A052369, A056608.

%K easy,nonn

%O 6,1

%A _Cino Hilliard_, Aug 13 2003

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Last modified August 29 22:07 EDT 2024. Contains 375518 sequences. (Running on oeis4.)