38872

Appears in sequences

• a(n) = (n+1)*(n^2+n+2)/2; g.f.: (1 + 2*x^2) / (1 - x)^4.at n=42A006000
• Numbers k such that k | 7^k + 7.at n=31A015893
• a(n) = prime(2^n)-1.at n=12A018249
• Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,2,1.at n=5A037564
• a(n) = Sum_{k=1..n} lcm(n,k).at n=42A051193
• a(n) = 3*a(n-1) + 5*a(n-2), with a(0)=1, a(1)=1.at n=8A072264
• Integer coefficients of a power series A(x) such that A(x)^3 = A083349(x).at n=18A083350
• Triangle, read by rows, where row n equals the inverse binomial transform of column n in the rectangular table A124530.at n=46A124539
• Numbers n such that the digital sum of n is the same as the digital sum of n^2 in both base 2 and base 10.at n=21A261640
• Triangle read by rows: T(n, k) is the number of nonequivalent ways to select k disjoint point triples from an n X n X n triangular point grid, each point triple forming a 2 X 2 X 2 triangle.at n=51A289229
• Number of nonequivalent ways to select 4 disjoint point triples from an n X n X n triangular point grid, each point triple forming a 2 X 2 X 2 triangle.at n=5A289231
• The fifth term of the greedy B_n set of natural numbers.at n=41A369817