1,1

Table of n, a(n) for n=1..56.

12^2 = 144 has same digits as 21^2 = 441, so 12 and 21 are in the sequence.

Sequence in context: A272270 A133894 A209725 * A257073 A239722 A112655

Adjacent sequences: A045876 A045877 A045878 * A045880 A045881 A045882

nonn,base

Erich Friedman

approved