179807

Properties

Appears in sequences

• a(n) = Sum_{k=1..n} sigma(k)*2^(n-k) where sigma(k) = A000203(k) is the sum of divisors of k.at n=15A066767
• Primes p such that the differences between the 5 consecutive primes starting with p are (6,6,2,6).at n=23A078965
• Number of positive numbers that can be built with n ones using +, -, and *, and require at least n ones.at n=39A348083
• Primes p such that p + 6, p + 12, p + 14, p + 20 and p + 26 are also primes.at n=13A384527
• Prime numbersat n=16321