23846

Appears in sequences

• Number of 3-valent trees (= boron trees or binary trees) with n nodes.at n=19A000672
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 88 ones.at n=32A031856
• Number of 3-valent trees (= boron trees or binary trees) with n nodes.at n=39A052120
• Records in A086183.at n=13A086186
• Number of unrooted bifurcating tree shapes with n leaves.at n=19A129860
• Consider the Euler totient function of a number x. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach x.at n=12A269309