22103

Appears in sequences

• Number of non-isomorphic maximal independent sets of the n-cycle graph.at n=51A127685
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..4 array extended with zeros and convolved with 1,2,1.at n=20A222123
• a(n) = 23*n^2.at n=31A244632
• Maximal non-semiprime number which is a "preprime" of the n-th kind (defined in comment in A247395).at n=25A247834
• G.f.: Product_{k>=1} (1 + x^k) / (1 - x^(k*(k+1)/2)).at n=35A280422
• a(n) is the index of the n-th nonattacking queen placed by a greedy algorithm on a subset of N^N (see Comments for details).at n=33A309817
• Numbers p^2*q, p > q odd primes such that q does not divide p-1, and q does not divide p+1.at n=38A350421
• Odd numbers k such that A173557(k) = A173557(sigma(k)), where A173557(n) is multiplicative with a(p^e) = p-1 and sigma is the sum of divisors function.at n=24A387159
• Primeshift array for primegap shift: Square array read by antidiagonals: A(1,col) = 3*col, and for row > 1, A(row,col) = A389084(A(row-1,col)).at n=41A389086