2002000

Appears in sequences

• Expansion of (-1 + 1/(1-10*x)^10)/(100*x); related to A053109.at n=4A053113
• n, n^2 and n^3 all use only even digits.at n=21A085586
• a(1) = 1. For n > 1, a(n) = a(n-1) if n is prime, a(n) = a(n-1)/n if n is composite and divides a(n-1) else a(n) = n*a(n-1).at n=27A088304
• a(1) = 1. For n > 1, a(n) = a(n-1) if n is prime, a(n) = a(n-1)/n if n is composite and divides a(n-1) else a(n) = n*a(n-1).at n=28A088304
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 8.at n=43A136908
• Column 4 of triangle in A144633.at n=11A144639
• In base 3, 0, together with numbers of the form i00j00k00m00... where i = 1 or 2 and j,k,m,... are 0, 1, or 2.at n=40A261660
• 1-parking triangle T(r, i, 1) read by rows: T(r, i, k) = (r + 1)^(i-1)*binomial(k*(r + 1) + r - i - 1, r - i) with k = 1 and 0 <= i <= r.at n=49A329057
• Base-10 super-weak Skolem-Langford numbers.at n=11A339803
• Numbers k such that k and k^3 use only even digits.at n=27A353342