25628

Appears in sequences

• Floor[n(n-1)(n-2)(n-3)/14].at n=26A011924
• Numbers k such that 3^k - k is prime.at n=11A058037
• a(n) = n*(2*n^2 -3*n +7)/6 = C(n, 1) + C(n, 2) + 2*C(n, 3).at n=42A081489
• a(n) = F(n+1)*F(2n+2) + F(n)*F(2n).at n=7A122909
• Triangle P, read by rows, where column k of P^2 equals column 0 of P^(2k+2) such that column 0 of P^2 equals column 0 of P shift one place left, with P(0,0)=1.at n=39A135880
• Column 3 of triangle A135880.at n=5A135884
• Triangle, read by rows, equal to R^4, the matrix 4th power of R = A135894.at n=15A135897
• Triangle, read by rows equal to the matrix product P^-1*R, where P = A135880 and R = A135894; P^-1*R equals triangle P shifted right one column.at n=49A135898
• Positive integers whose square is the sum of 96 consecutive squares.at n=14A257827
• Numbers k such that 10^k - 1000000001 is prime.at n=26A273679
• Sum of the even singletons in all partitions of n (n>=0). A singleton in a partition is a part that occurs exactly once.at n=28A276425
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 366", based on the 5-celled von Neumann neighborhood.at n=51A287854
• Numbers k such that [prime(k), prime(k+1), prime(k+2)] = [1, 2, 3] mod 11.at n=34A302767
• a(n) = 2*n*(7*n - 3).at n=43A316466
• a(n) = (1/n) * Sum_{k=1..n} k * lcm(k,n).at n=42A344509