26961

Appears in sequences

• Numbers in which all pairs of consecutive base-7 digits differ by 3.at n=43A033078
• Number of hexagonal regions in regular n-gon with all diagonals drawn.at n=51A067153
• Coefficients of the sixth-order mock theta function psi_{-}(q).at n=31A153252
• Number of 1..30 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1.at n=2A171304
• Number of 1..n integer arrays v[1..3] of length 3 with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..2.at n=29A171340
• Number of vertices in truncated tetrahedron with faces that are centered polygons.at n=16A193218
• Composite squarefree numbers k such that the arithmetic mean of the distinct prime factors of k is a prime p, and p divides k.at n=39A229094
• Numbers k such that k and k+1 are the product of exactly four distinct primes.at n=28A318896
• Numbers which are the product of two S-primes (A057948) in exactly three ways.at n=24A343828
• G.f. satisfies A(x) = 1/(1 - x) + x/A(x).at n=9A366356