18061

Properties

Appears in sequences

• Number of domino tilings of 4 X (n-1) board.at n=11A005178
• a(n) is the sum over all floor(k^3/n), k=0 to n inclusive.at n=40A014818
• Number of perfect matchings in graph P_{10} X P_{n}.at n=4A028472
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 100 ones.at n=6A031868
• Prime number spiral (clockwise, Northeast spoke).at n=23A054553
• Numbers n such that 7*3^n + 2 is prime.at n=15A058603
• Centered 20-gonal (or icosagonal) numbers.at n=42A069133
• Pentanacci numbers for following initial values: a(0) = 1, a(1) = -1, a(2) = 1, a(3) = -1, a(4) = 1.at n=20A122997
• a(n) = 15*n^2 - 9*n + 1.at n=35A134154
• Prime numbers p such that p +- ((p-1)/5) are primes.at n=15A137714
• Primes congruent to 41 mod 53.at n=37A142571
• Primes congruent to 7 mod 59.at n=33A142734
• Primes congruent to 5 mod 61.at n=33A142803
• Primes p such that p1=Floor[p/2]+p is prime and p2=Ceiling[p1/2]+p1 is prime.at n=38A158712
• Triangle T(m,n) read by rows: number of domino tilings of the m X n grid (0 <= m <= n).at n=59A187616
• Array T(m,n) read by antidiagonals: number of domino tilings of the 2m X 2n grid (m>=0, n>=0).at n=30A187617
• Array T(m,n) read by antidiagonals: number of domino tilings of the 2m X 2n grid (m>=0, n>=0).at n=33A187617
• Triangle T(m,n) read by rows: number of domino tilings of the 2m X 2n grid (0 <= m <= n).at n=17A187618
• Third row of array in A187617.at n=5A188899
• Primes of the form 2*n^3 + 5*n^2 + 3*n + 1.at n=11A196153