20428

Appears in sequences

• Coordination sequence for alpha-Mn, Position Mn1.at n=37A009950
• Binomial transform of [1, 1, 5, 5, 5, ...].at n=12A131064
• The Wiener index of the graph \|/_\/_\/_..._\/_\|/ having n nodes on the horizontal path.at n=20A180571
• Number of odd prime powers (A246655) between 2^n and 2^(n+1).at n=18A244508
• Least k > 1 such that k^n is a twin rank (cf. A002822: 6*k^n +- 1 are twin primes).at n=40A326230
• Number of cyclic arrangements of {1..n} such that any three neighbors satisfy the triangle inequality.at n=12A338564
• Number of partitions of n such that 4*(least part) <= greatest part.at n=36A363276