38220

Appears in sequences

• Theta series of A*_13 lattice.at n=68A023925
• a(n) = Sum_{k=0..n} (k+1) * A026637(n,k).at n=12A026970
• a(n) = 49*(n-1)*(n-2)/2.at n=38A027469
• a(n) = 2*(n+1)*binomial(n+2,4).at n=11A027777
• a(n) = 6*(n+1)*binomial(n+2,12).at n=3A027785
• a(n) = n*(n-1)^2*(n-2).at n=13A047928
• Composite numbers k such that number of composite d with 3 < d < k, gcd(k, d) = 1, is pi(k).at n=7A049011
• Numbers k such that k | sigma_9(k) - phi(k)^9.at n=35A055703
• McKay-Thompson series of class 36C for Monster.at n=50A058646
• Smallest number whose set of divisors contains each digit 0-9 at least n times.at n=12A059436
• Smallest number whose set of divisors contains each digit 0-9 at least n times.at n=13A059436
• Numbers n such that core(n)=floor(sqrt(n)), where core(x)=A007913(x) is the squarefree part of x and floor(sqrt(x))=A000196(x).at n=17A069186
• Triangle read by rows: T(n, k) = binomial(n, k) * binomial(n+k, n-k).at n=41A092371
• Triangle read by rows: T(n,k) = (n+1,k)-th element of (M^4-M)/3, where M is the infinite lower Pascal's triangle matrix, 1<=k<=n.at n=30A096035
• Numbers whose set of base 14 digits is {0,D}, where D base 14 = 13 base 10.at n=12A097260
• Expansion of x(1-2x+3x^2)/(1-x-2x)^2;.at n=14A099431
• Triangle read by rows: (1/4) * (A007318^3 - A007318^(-1)) as infinite lower triangular matrices.at n=49A131049
• a(n) = n*(n+1)*(5*n+7)/6.at n=35A162148
• Number of reduced words of length n in Coxeter group on 15 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.at n=4A162785
• Number of binary strings of length n with no substrings equal to 0001 0101 or 1110.at n=23A164475