40528

Appears in sequences

• G.f.: Product_{n >= 0} (1+x^(2n+1))/(1-x^(2n+1)).at n=46A080054
• Expansion of f(-q) / f(q) in powers of q where f() is a Ramanujan theta function.at n=46A108494
• Expansion of phi(q^2) / phi(-q) in powers of q where phi() is a Ramanujan theta function.at n=23A208850
• Number of nonnegative integer arrays of length n+4 with new values 0 upwards introduced in order, no three adjacent elements equal, and containing the value n+1.at n=20A211837
• Number of compositions of n where the difference between largest and smallest parts equals 5 and adjacent parts are unequal.at n=17A214274
• 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=14A269309
• Number of length n inversion sequences avoiding the patterns 110, 210, 120, 201, and 010.at n=10A279553
• Even integers k such that lambda(sum of even divisors of k) = sum of odd divisors of k.at n=41A293356
• a(n) is the least integer k such that k/Fibonacci(n) > sqrt(2).at n=23A293419
• Total number of parts coprime to n in the partitions of n into 8 parts.at n=42A363326