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A141250
Prime powers related to minimal visibility in the square n X n lattice.
1
11, 17, 23, 37, 41, 97, 101, 121, 137, 157, 191, 211, 223, 227, 331, 347, 431, 443, 457
OFFSET
1,1
COMMENTS
So far 121 is the only composite here. The numbers in A141249 greater than 1 are 2*a(n)-1.
CROSSREFS
Cf. A141246.
Sequence in context: A076812 A074207 A063638 * A316188 A096454 A099722
KEYWORD
nonn
AUTHOR
T. D. Noe, Jun 17 2008
STATUS
approved