28856

Appears in sequences

• Fibonacci sequence beginning 2, 28.at n=16A022376
• Numbers k such that k divides the (right) concatenation of all numbers <= k written in base 22 (most significant digit on right).at n=31A029515
• n*10^3-1, n*10^3-3, n*10^3-7 and n*10^3-9 are all prime.at n=14A064977
• Number of (n+2) X 5 0..3 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order.at n=7A204637
• Number of partitions p of n such that m(p) <= m(c(p)), where m = maximal multiplicity of parts, and c = conjugate.at n=41A240727
• First differences of (provable) Sierpiński numbers (A076336).at n=29A270971
• Numbers n such that the average of the positive divisors of n is a Fibonacci number.at n=37A272440