18586

Appears in sequences

• Number of paraffins.at n=42A005999
• Numbers k such that k+1, k^2+1 and k^4+1 are primes.at n=40A070325
• Numbers n such that h(n) = 3 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)at n=15A078420
• a(n) = 15*n^2 + 6*n + 1.at n=35A080861
• Number of partitions p of n such that the number of distinct parts is a part or max(p) - min(p) is a part.at n=40A241391
• Tribonacci-like sequence a(n) = a(n-1) + a(n-2) + a(n-3) for n >= 3, with a(0) = 1, a(1) = 2, a(2) = 1.at n=17A275778
• Number of partitions of [n] whose non-singleton elements sum to n.at n=38A370946