2666689
domain: N
Appears in sequences
- Squares that remain square when the digit 6 is appended.at n=4A023113
- Squares with digits in nondecreasing order.at n=32A028820
- Squares such that digits of sqrt(n) are not present in n^(3/2).at n=21A029788
- Expansion of g.f. -(1+27*x^2)/((1+3*x)*(1-2*x+9*x^2)).at n=17A106632
- Numbers n (other than powers of 2) such that abs(abundance(n)) is an odd square.at n=9A188484
- Drop the last digit of A023110(n).at n=18A202303
- Numbers k such that triangular(k) + triangular(2*k) is a square.at n=7A224419
- Perfect powers whose digits are in nondecreasing order.at n=34A355062