40000000000
domain: N
Appears in sequences
- Powers of 2 written in base 8.at n=32A004647
- Squares such that (1) each digit is a square, (2) the sum of squares of the digits is a square.at n=24A061272
- Smallest n-digit square starting with 4.at n=10A067474
- Expansion of (1-6*x)/(1-10*x).at n=11A093141
- Erroneous version of A052218.at n=20A094628
- Expansion of (1+4x-6x^2-36x^3)/(1-19x^2+90x^4).at n=21A097112
- Numbers k such that the k-th triangular number contains only digits {0,2,8}.at n=20A119056
- Complete list of all 5 numbers n such that n is equal to the number of 5's in the decimal digits of all numbers <= n.at n=4A130427
- Complete list of all 9 numbers n such that n is equal to the number of 9's in the decimal digits of all numbers <= n.at n=4A130431
- Numbers n such that the sum of all numbers formed by deleting one digit from n is equal to n.at n=35A131639
- Numbers k such that k and k^2 use only the digits 0, 1, 4 and 6.at n=22A136859
- Squares that remain squares when prefixed with a 6.at n=19A167041
- Squares containing only the digits 0, 4 or 8.at n=26A202172
- Numbers representable as x^x * y^y, with x > y > 1.at n=20A228174
- Squares which have one or more occurrences of exactly two different digits.at n=34A235717
- a(n) = Product_{k=0..n-1} n/gcd(n, A056040(k)).at n=20A294038
- Squares composed of digits {0,2,4}.at n=13A349460
- Perfect squares whose decimal expansion consists of k > 1 digits, k-1 of which are equal.at n=27A368049