23389

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 96 ones.at n=20A031864
• Numbers having four 5's in base 8.at n=18A043444
• How many more primes than irreducible GF(2)[X] polynomials there are in range [0,2^n].at n=20A091231
• Number of (n+2) X 7 0..2 arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=5A186564
• Number of (n+2) X 8 0..2 arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=4A186565
• Consider a number of k digits n = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + … + d_(2)*10 + d_(1). Sequence lists the numbers n such that sigma(n) - n = Sum_{i=1..k-1}{phi(Sum_{j=1..i}{d_(k-j+1)*10^(i-j)})} (see example below).at n=8A240900
• a(n) = prime(n)^3 - n^3.at n=9A262186
• Numbers without a digit 1 with digits in nondecreasing order and the product of digits is a power of 6.at n=26A304392
• G.f. A(x) satisfies: A(x) = x * (1 + A(x))^5 / (1 - 3 * A(x)).at n=5A366035