28230

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 56.at n=5A031734
• Smallest of first string of exactly 2n-1 consecutive composite integers.at n=23A045881
• First subsequent, disjoint occurrence of n consecutive nonprimes.at n=40A060064
• Numbers k such that 4*k-1, 8*k-1, 16*k-1 and 32*k-1 are all primes.at n=17A101794
• Positions of hexagonal pyramidal numbers in the EKG sequence.at n=34A144080
• a(n) = 36*n^2 + 6.at n=27A158479
• Number of unlabeled, connected graphs on n vertices with at least one induced subgraph isomorphic to a K_5, where K_5 is the complete graph on five vertices.at n=8A243242
• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.at n=8A260170
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.at n=36A260177
• a(n) is the associated coefficient of the n-uniform simplex.at n=3A320653
• a(n) is the smallest positive integer that begins a run of exactly 2*n-1 consecutive integers having at least 4 divisors each.at n=23A340735
• Squarefree integers k such that x^4 - k*y^2 = 1 has a nontrivial solution.at n=36A356496