6291455

Appears in sequences

• a(0) = 1; a(n) = 3*2^n - 1, for n > 0.at n=21A052940
• a(0) = 0; for n > 0, a(n) = 3*2^(n-1) - 1.at n=22A055010
• Smallest number x > 1 such that phi(x) + sigma(x) = k*d(x)^n, i.e., the left-hand side is divisible by the n-th power of the number of divisors.at n=10A055470
• a(0) = 1; for n > 0, a(n) = 3*2^(n-1) - 1.at n=22A083329
• Smallest semiprime with Hamming weight n (i.e., smallest semiprime with exactly n ones when written in binary), or -1 if no such number exists.at n=21A102029
• Slater-Velez permutation sequence of the 2nd kind.at n=42A129198
• a(n) = 6*4^n - 1.at n=10A140529
• a(n) = 3*(-1)^(n+1)*2^n - 1.at n=21A140683
• a(n) = 3*2^n - 1.at n=21A153893
• a(n) = 3*8^n-1.at n=7A198851
• Numbers k such that A249441(k) = 3.at n=36A249452
• Decimal representation of the n-th iteration of the "Rule 155" elementary cellular automaton starting with a single ON (black) cell.at n=11A263245
• Numbers n such that the Shevelev polynomial {m, n} has a root at m = -1.at n=31A264613
• Independence number of the n-Mycielski graph.at n=23A266550
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 641", based on the 5-celled von Neumann neighborhood.at n=22A283507
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 873", based on the 5-celled von Neumann neighborhood.at n=23A284349
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 950", based on the 5-celled von Neumann neighborhood.at n=22A284481
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 189", based on the 5-celled von Neumann neighborhood.at n=23A286506
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 545", based on the 5-celled von Neumann neighborhood.at n=22A289099
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 641", based on the 5-celled von Neumann neighborhood.at n=22A290074