18905

Appears in sequences

• Noninscribable simplicial polyhedra with n nodes.at n=13A007037
• Sums of 5 distinct powers of 5.at n=14A038477
• Number of {-1,0,1} n X n matrices that have (real and) positive eigenvalues.at n=3A085506
• (prime(n)*(prime(n+1)-1) + (prime(n)-1)*prime(n+1)) / 2.at n=31A099909
• a(n) = A160799(n)/4.at n=41A160807
• The smallest number which when multiplied by the n-th repunit gives a Smith number.at n=50A176385
• Number of conjugacy classes for a non-abelian group of order p^3, where p is prime: a(n) = p^2 + p - 1 where p = prime(n).at n=32A319597
• Positive numbers k such that -k, -(k + 1), and -(k + 2) are 3 consecutive negative negaFibonacci-Niven numbers (A331088).at n=44A331090
• Number of Aut(G)-orbits on G-characters that come from Riemann surfaces of genus n.at n=31A347373
• Antidiagonal sums of A354967.at n=8A359278
• Index where prime(n) appears as a term in A379248.at n=48A379290
• Number of integer compositions of n that are the first sums of a unique composition.at n=27A391644