109225

Appears in sequences

• Generalized Jacobsthal numbers.at n=16A084640
• Numbers n such that n-1, n and n+1 can be expressed as a sum of 2 squares in at least 2 ways.at n=21A091459
• a(n) = 5*(4^(n+1) - 1)/3.at n=7A146882
• A generalized Jacobsthal sequence.at n=15A159290
• Number of steps required by the Hwang-Deutsch merging algorithm.at n=30A260795
• a(n) is the least integer k such that sigma(k)/(d(k)*sopf(k)) = n where d=A000005, sigma=A000203 and sopf=A008472.at n=42A328174