37915

Appears in sequences

• Odd numbers k such that the palindromic wing number (a.k.a. near-repdigit palindrome) 7*(10^k - 1)/9 - 2*10^((k-1)/2) is prime.at n=13A077785
• Numbers k such that sigma(phi(k)) - phi(sigma(k)) is nonzero and divisible by sigma(k), that is A065395(k)/A000203(k) is a nonzero integer.at n=29A092588
• Number of permutations of length n which avoid the patterns 321, 2341, 4123.at n=13A116716
• G.f. satisfies: A(x) = Product_{n>=0} 1/( (1 - (x*A(x))^(5*n+2)) * (1 - (x*A(x))^(5*n+3)) ).at n=14A203068