OFFSET
1,1
COMMENTS
This is based on the square spiral with entries starting at 1 (see A317186, Examples).
REFERENCES
David James Sycamore, Posting to Sequence Fans Mailing List, Jul 24 2018
FORMULA
a(n) = prime(A317186(n)).
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 27 2018
STATUS
approved