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.

4, 988, 1612, 3172, 5332, 7852, 11908, 18748, 19276, 21268, 21508, 25156, 32188, 35932, 41116, 41452, 43108, 50236, 54436, 55876, 57412, 62452, 65836, 71248, 72748, 74572, 85828, 88996, 96772, 97708, 99292, 103948, 104956, 105772, 110812, 116356, 116428

Offset: 1

Author

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

Keywords

• nonn
• less

Crossrefs

Cf. A157449, A175727 and A179945.

Extensions

Divisibility requirement added to definition to match the sequence; 4 and terms beyond 7852 added - R. J. Mathar, Aug 25 2010