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A180268 Numbers n, not divisible by 3, 5, 7 or 11, such that A000203(n)-n-1 and 2*n+1-A000203(n) are prime numbers. 0

%I #3 Mar 30 2012 17:40:25

%S 4,988,1612,3172,5332,7852,11908,18748,19276,21268,21508,25156,32188,

%T 35932,41116,41452,43108,50236,54436,55876,57412,62452,65836,71248,

%U 72748,74572,85828,88996,96772,97708,99292,103948,104956,105772,110812,116356,116428

%N Numbers n, not divisible by 3, 5, 7 or 11, such that A000203(n)-n-1 and 2*n+1-A000203(n) are prime numbers.

%Y Cf. A157449, A175727 and A179945.

%K nonn,less

%O 1,1

%A Alexey Galkin (fetch91(AT)gmail.com), Aug 23 2010

%E Divisibility requirement added to definition to match the sequence; 4 and terms beyond 7852 added - _R. J. Mathar_, Aug 25 2010

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Last modified May 6 14:34 EDT 2024. Contains 372294 sequences. (Running on oeis4.)