42444

Appears in sequences

• Numbers having four 4's in base 10.at n=6A043508
• Numbers n such that n^2 is divisible by the sum of the distinct prime divisors of n^2 + 1.at n=24A196219
• Expansion of 1/(1 - x - x^2 + x^5 - x^7).at n=25A204631
• Number of interior points that are the intersections of exactly two chords in the configuration A006561(n).at n=35A292104
• The number of interior points that are intersections of exactly two chords for a 2n-gon where all its vertices are joined by lines (cf. A006561).at n=17A352144