Squares of primes having digits in nondecreasing order.

Terms

a(0) =4a(1) =9a(2) =25a(3) =49a(4) =169a(5) =289a(6) =1369a(7) =4489a(8) =6889a(9) =11449a(10) =27889a(11) =113569a(12) =134689a(13) =146689a(14) =344569a(15) =2778889a(16) =27777888889a(17) =111113555569a(18) =111133556689a(19) =111333666889a(20) =113344668889a(21) =444444888889