9090909091

Appears in sequences

• a(n) = (1 - (-10)^n)/11.at n=10A014992
• Gaussian binomial coefficient [ n,10 ] for q=-10.at n=1A015398
• a(n) = 9*a(n-1) + 10*a(n-2).at n=11A015585
• Cyclotomic polynomials at x=10.at n=21A019328
• Cyclotomic polynomials at x=-10.at n=11A020509
• Divisors of 10^11 + 1.at n=22A027899
• Value of n-th cyclotomic polynomial at phi(n).at n=21A070524
• Smallest k > 0 such that nk-1 is an n-th power, or 0 if no such number exists.at n=10A076951
• a(n) = Sum_{k=0..n} (-1)^(n-k)*n^k.at n=10A081209
• 1+integers repeating "90" decimal digit pattern.at n=5A095372
• Floor[ (digits n times n) divided by digits (n times 1)].at n=9A110370
• Numbers m which when sandwiched between two 1's give a multiple of m.at n=15A116436
• Numbers k which when sandwiched between two 2's give a multiple of k.at n=29A116437
• Numbers k which when sandwiched between two 3's give a multiple of k.at n=31A116438
• Numbers k which when sandwiched between two 5's give a multiple of k.at n=31A116440
• Numbers k which when sandwiched between two 7's give a multiple of k.at n=26A116442
• a(n) = Sum_{j=0..10} (-n)^j.at n=10A269486
• Numbers k such that k^2 divides 10^k + 1.at n=31A292335
• a(n) is the number of monic polynomials of degree n over GF(11) without linear factors.at n=10A355511