20774
domain: N
Appears in sequences
- Numbers k such that 67*2^k+1 is prime.at n=29A032383
- a(n) = least number not of form [ (a^2+b^2)/n ].at n=32A036574
- Number of partitions satisfying cn(0,5) <= cn(1,5) and cn(0,5) <= cn(4,5).at n=39A039837
- Smallest k > 0 with gcd(k, rev(k)) = n, where rev(k) is digit reversal of k, or 0 if no such k exists.at n=33A069554
- Wiener index of the Moebius ladder M(n).at n=33A180857
- Number of free trees of n vertices whose automorphisms are a 2-group.at n=17A309352