733007751851
domain: N
Appears in sequences
- a(n) = (2^(2*n + 1) + 1)/3.at n=20A007583
- A Jacobsthal number sequence.at n=13A082365
- a(n) = (2^prime(n) + 1)/3.at n=11A126614
- Composite numbers of the form (2^p+1)/3 where p is a prime.at n=2A127955
- Nonprime numbers of the form 1 + Sum_{k=1..m} 2^(2*k - 1).at n=10A127959
- First quadrisection of A139763 (1, 2, 3, 4, 11, ...).at n=10A139792
- a(n) = -1/6 + (-1)^n/2 + 2*4^n/3.at n=20A140322
- Numbers of the form (2^(p*q)-1) /((2^p-1)*(2^q-1)), where p>q are primes.at n=19A140803
- The Jacobsthal sequence, dropping each third term.at n=27A141355
- Interleave A007583 and A000012.at n=40A166752
- Jacobsthal numbers which are semiprimes.at n=9A277356
- a(n) = Sum_{k=0..n} binomial(2*n+1,3*k).at n=20A387868