OFFSET
1,1
COMMENTS
The sides of the successive squares are given by A158025. Terms computed by Jean-Marc Falcoz.
LINKS
Robert Israel, Table of n, a(n) for n = 1..3000
Eric Angelini, Digit Spiral
E. Angelini, Digit Spiral [Cached copy, with permission]
EXAMPLE
...2...23...2357
.......57...1113
............1719
............2329
The primes fitting exactly in the SE corner of the above squares are 2, 7, 29. There is no 3X3 square where this is possible.
MAPLE
X:= 0: p:= 1:
Res:= NULL: count:= 0:
while count < 100 do
p:= nextprime(p);
X:= X + ilog10(p) + 1;
if issqr(X) then Res:= Res, p; count:= count+1 fi
od:
Res; # Robert Israel, Jan 13 2020
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini, Mar 11 2009
STATUS
approved