4000000

Appears in sequences

• Discriminant of n-th cyclotomic polynomial.at n=19A004124
• Powers of 2 written in base 8.at n=20A004647
• Powers of 2 written in base 16.at n=26A004655
• Squares using no more than two distinct digits.at n=30A018885
• Squares with digits in nonincreasing order.at n=25A028822
• Squares whose digits are all even.at n=33A030098
• a(n+1) is smallest square > a(n) having no digits in common with a(n), with a(0) = 0.at n=36A030288
• Replacing digits d in decimal expansion of n with d^3 yields a square.at n=30A048391
• a(n)=2*a(n-1), except every tenth time you multiply by 1000/512 instead of by 2.at n=22A051535
• Numbers n such that Sum_{k=1..n} d(k) is an integer where d(k) is the decimal fraction 0.k (e.g. d(999)=0.999).at n=11A054464
• Squares such that each digit is a square and the sum of the digits is a square.at n=21A061270
• Squares such that (1) each digit is a square, (2) the sum of squares of the digits is a square.at n=13A061272
• Squares which produce squares when the leading digit is moved to the end.at n=20A061459
• Smallest n-digit square starting with 4.at n=6A067474
• Square such that the next three squares also having a square digit sum.at n=18A068834
• Squares which leave a square at every step if most significant digit and least significant digit are deleted until a one-digit or two-digit square is obtained.at n=34A077487
• Expansion of (1-6*x)/(1-10*x).at n=7A093141
• Erroneous version of A052218.at n=12A094628
• Expansion of (1+4x-6x^2-36x^3)/(1-19x^2+90x^4).at n=13A097112
• Numbers k such that the k-th triangular number contains only digits {0,2,8}.at n=13A119056