25298

Appears in sequences

• Denominators of convergents to Cahen's constant: a(n+2) = a(n)^2*a(n+1) + a(n).at n=6A006279
• Theta series of 14-dimensional lattice M14,6 with minimal norm 6.at n=6A047637
• a(n) = n-th multiple of n with digit sum n.at n=25A082260
• Square array, read by antidiagonals, where rows are successive self-convolutions of the top row, which equals A003169 shifted one place right.at n=51A100324
• Let r_1 = 1. Let r_{m+1} = r_1 + 1/(r_2 + 1/(r_3 +...(r_{m-1} + 1/r_m)...)), a continued fraction of rational terms. Then a(n) is the number of (positive integer) terms in the simple continued fraction of r_n.at n=17A138743
• If p and q are (odd) twin primes and q > p then p*q^2+(p+q)+1 is divisible by 3; a(n) = (p*q^2+(p+q)+1)/3.at n=5A164689
• Numbers m such that the GCD of the x's that satisfy sigma(x) = m is 4.at n=28A241649
• Numbers k such that card({x|sigma(x)=k}) > 1 and (Sum_{sigma(x)=k} x) < k.at n=32A258931
• Convolution of nonzero squares (A000290) with nonzero pentagonal numbers (A000326).at n=12A271663
• Number of length-n binary words having exactly one nontrivial palindrome prefix.at n=15A308529
• Bases b where exactly eight primes p with p < b exist such that p is a base-b Wieferich prime.at n=10A325884