55906

Appears in sequences

• The limiting sequence [A259095(r(r+1)/2-s,r), s=0,1,2,...,r-1] for very large r.at n=48A005576
• Square root of n has the same nonzero digit in each of the first 4 places to the right of the decimal point.at n=20A073585
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (1, -1, 1), (1, 0, -1), (1, 1, 0)}.at n=9A149384
• a(n) = 81*n^2 - 118*n + 43.at n=27A156677
• Number of steps to reach 1 in '3x+1' (or Collatz) problem starting with the n-th Mersenne prime.at n=18A181777
• Numbers k such that 4*10^k + 21 is prime.at n=26A276047