36906

Appears in sequences

• Numbers having four 5's in base 9.at n=25A043476
• a(2*n) = 3*a(2*n-1) - 1, a(2*n+1) = 3*a(2*n), with a(1)=1.at n=10A153773
• Expansion of (1 + 8*x - 6*x^2 + 12*x^3 - 18*x^4)/(1 - x - 9*x^4 + 9*x^5).at n=20A309791
• Centered pentagonal numbers which are products of three distinct primes.at n=19A364610
• Centered pentagonal numbers that are abundant.at n=20A382696