90909091

Appears in sequences

• a(n) = (1 - (-10)^n)/11.at n=8A014992
• Gaussian binomial coefficient [ n,8 ] for q=-10.at n=1A015367
• a(n) = 9*a(n-1) + 10*a(n-2).at n=9A015585
• Divisors of 10^9 + 1.at n=29A027901
• a(n) = (n+1)^n/(n+2) - (-1)^n/(n+2).at n=9A083062
• 1+integers repeating "90" decimal digit pattern.at n=4A095372
• Numbers m which when sandwiched between two 1's give a multiple of m.at n=13A116436
• Numbers k which when sandwiched between two 2's give a multiple of k.at n=24A116437
• Numbers k which when sandwiched between two 3's give a multiple of k.at n=26A116438
• Numbers k which when sandwiched between two 4's give a multiple of k.at n=37A116439
• Numbers k which when sandwiched between two 5's give a multiple of k.at n=26A116440
• Numbers k which when sandwiched between two 7's give a multiple of k.at n=21A116442
• Numbers k which when sandwiched between two 9's give a multiple of k.at n=35A116444
• Legendre-binomial transform of 10^n for p=3.at n=8A117611
• a(n) = ((2n)^(2n-1)+1)/(2n+1).at n=4A128897