57205

Appears in sequences

• Generalized Euler numbers O_n^+(2).at n=8A007976
• Strong pseudoprimes to base 13.at n=19A020239
• Floor[ concatenation of n+2, n+1 and n divided by 3 ].at n=15A075004
• Number of zero-sum -n..n arrays of 4 elements with first through third differences also in -n..n.at n=41A202512
• Number of n X 4 0..2 arrays with no element equal to any value at offset (-1,0) (0,-1) or (-2,-2) and new values introduced in order 0..2.at n=9A274854
• Expansion of (Product_{k>0} (1 - x^(5*k)) / (1 - x^k))^5 in powers of x.at n=11A285928
• G.f.: Sum_{n>=0} (n+1)*(n+2)*(n+3)*(n+4)/4! * x^n * (1 + x^n)^n.at n=27A326005
• Odd composite integers m such that U(m)^2 == 1 (mod m) and V(m) == 5 (mod m), where U(m) and V(m) are the m-th generalized Lucas and Pell-Lucas numbers of parameters a=5 and b=-1, respectively.at n=38A337628
• Composite numbers k of the form 4u+1 for which the odd part of phi(k) divides k-1.at n=28A339870