1327105

Appears in sequences

• a(n) = Sum_{d|n} (2^(n-d)).at n=20A074854
• Pierpont 4-almost primes: numbers with exactly 4 prime divisors, not necessarily distinct, of the form 2^K*3^L + 1.at n=12A111344
• a(n) = 4*n^4 + 1.at n=23A211412
• 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 531", based on the 5-celled von Neumann neighborhood.at n=23A282952