26885
domain: N
Appears in sequences
- Numbers k such that k, k+1, k+2 and k+3 have the same number of divisors.at n=34A006601
- Pseudoprimes to base 39.at n=38A020167
- a(n) = A047980(2n).at n=30A047981
- Odd composites (including 1 in the count) where the number 1 mod 4 equals the number 3 mod 4.at n=8A093180
- Number of A095746-primes in range ]2^n,2^(n+1)].at n=20A095756
- Number of Garden of Eden partitions of n in Bulgarian Solitaire.at n=42A123975
- 3-almost prime octagonal numbers.at n=21A129927
- a(n) = (1/2)*(F(n+2)-1)*(F(n+2)-2) + F(n), where F() are the Fibonacci numbers.at n=10A131569
- a(0)=1, a(1)=5, a(n) = 20*a(n-2) - a(n-1).at n=7A165470
- Triangle, read by rows, defined by T(n, k) = b(n) - b(k) - b(n-k) + 1, where b(n) = 5*b(n-1) - 4*b(n-2) + 3*b(n-3) - 2*b(n-4) - b(n-5) and b(0) = 0, b(1) = 1, b(2) = 5, b(3) = 21, b(4) = 88.at n=40A176483
- Number of partitions p of n including floor(mean(p)) as a part.at n=41A241334
- a(n) = n-th pseudoprime to base n.at n=37A247906
- Octagonal numbers that are the product of three distinct primes.at n=17A382231