Internal digits of n^2 include digits of n, n does not end in 0.

Terms

a(0) =74a(1) =278a(2) =463a(3) =501a(4) =502a(5) =503a(6) =504a(7) =505a(8) =506a(9) =507a(10) =508a(11) =509a(12) =523a(13) =601a(14) =602a(15) =603a(16) =724a(17) =878a(18) =1276a(19) =1463a(20) =1523a(21) =1623a(22) =1627a(23) =1774a(24) =1839a(25) =2509a(26) =2574a(27) =2639a(28) =2778a(29) =2982