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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..19.

CROSSREFS

Cf. A141246.

Sequence in context: A076812 A074207 A063638 * A316188 A096454 A099722

Adjacent sequences:  A141247 A141248 A141249 * A141251 A141252 A141253

KEYWORD

nonn

AUTHOR

T. D. Noe, Jun 17 2008

STATUS

approved

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Last modified June 22 13:46 EDT 2021. Contains 345380 sequences. (Running on oeis4.)