40859

Appears in sequences

• Pisot sequence E(4,10).at n=10A020709
• Start with i=1 and j=2. Concatenate i and j, get k = floor(ij/j), concatenate j and k, etc.at n=25A127320
• Numbers k such that sigma(k)/phi(k) = 25/16.at n=0A164648
• Triangle of numerators of coefficients of the polynomial Q_m(n) defined by the recursion Q_0(n)=1; for m >= 1, Q_m(n) = Sum_{i=1..n} i*Q_(m-1)(i). For m >= 1, the denominator for all 2*m+1 terms of the m-th row is A053657(m+1).at n=52A202339
• Least positive integer k such that both k and k*n belong to the set {m>0: 2*prime(prime(m))+1 = prime(p) for some prime p}.at n=17A261362