|
%I #12 Apr 03 2023 10:36:10
%S 4,9,121,10201,94249,900075181570009,12124434743442121,
%T 12323244744232321,12341234943214321,1022321210249420121232201,
%U 1210024420147410244200121,1210222232227222322220121
%N Palindromic squares with a prime root.
%C Record sporadic palindromic square with a prime root is 186627875420278656872024578726681.
%H P. De Geest, <a href="http://www.worldofnumbers.com/square.htm">Palindromic Squares</a>
%H G. L. Honaker, Jr. and C. Caldwell, <a href="https://t5k.org/curios/page.php?short=13661181333262459">Prime Curios!</a>
%H William Rex Marshall, <a href="http://web.archive.org/web/20020614225321/http://www.geocities.com:80/williamrexmarshall/math/palsq.html">Palindromic Squares</a> [Internet Archive Wayback Machine]
%e a(6) = 900075181570009 = p^2 with p = 30001253, a prime.
%Y Cf. A065378, A002778, A002779, A034822, A028816, A016106, A059744, A016113, A007573.
%K nonn,base
%O 1,1
%A _Patrick De Geest_, Nov 03 2001
| 