263160
domain: N
Appears in sequences
- Numbers taking exactly 21 steps to reach 15 in A086793.at n=23A119397
- a(n) = Sum_{d|n} phi(n/d)^2*2^d.at n=18A160620
- Numbers k such that k^2 XOR (k+1)^2 is a square, and k^2 XOR (k-1)^2 is a square, where XOR is the bitwise logical XOR operator.at n=10A224242
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 62", based on the 5-celled von Neumann neighborhood.at n=9A270080
- The least totient number k with exactly n solutions to the equation phi(x) = k, where all the solutions are nontotient numbers (A007617).at n=26A378510