A141250 Prime powers related to minimal visibility in the square n X n lattice.

11, 17, 23, 37, 41, 97, 101, 121, 137, 157, 191, 211, 223, 227, 331, 347, 431, 443, 457

Offset: 1

Author

T. D. Noe, Jun 17 2008

Keywords

• nonn

Comments

So far 121 is the only composite here. The numbers in A141249 greater than 1 are 2*a(n)-1.

Crossrefs

Cf. A141246.