27202

Appears in sequences

• a(0) = 1, a(n) = 17*n^2 + 2 for n>0.at n=40A010007
• Pisot sequences E(5,7), P(5,7).at n=23A020711
• Pisot sequences E(7,10), P(7,10).at n=22A020721
• Sum of the digits of the n-th Mersenne prime (A000668).at n=23A066538
• a(n) = lcm(A066840(n), A124440(n)).at n=44A124447
• a(n) = floor(sqrt(a(n-1)^2 + a(n-2)^2 + a(n-1)*a(n-2))), a(1)=1, a(2)=3.at n=26A128424
• Number of sets of 4 distinct collinear points in an n X n permutation array in which leftmost pair has same spacing as rightmost pair.at n=20A234471
• a(n) = n*(n + 1)*(7*n + 5)/6.at n=28A304993
• Approximation of the 3-adic integer exp(3) up to 3^n.at n=10A309900
• Approximation of the 3-adic integer exp(3) up to 3^n.at n=11A309900
• Number of n-step self-avoiding walks on three quadrants of a 2D square lattice.at n=10A348057
• Expansion of g.f. Sum_{n>=1} q^n/(1-q^n-q^(3*n)).at n=28A368688
• Number of maximum sized subsets of {1..n} such that every pair of distinct elements has a different sum.at n=44A382398