49183

Appears in sequences

• Numbers n such that n and n+4 are both brilliant numbers (A078972).at n=28A083285
• G.f. satisfies: A(x) = 1/(1 + x*A(x^7)) and also the continued fraction: 1 + x*A(x^8) = [1; 1/x, 1/x^7, 1/x^49, 1/x^343, ..., 1/x^(7^(n-1)), ...].at n=52A101917
• Numbers k such that k^p-p is prime, where p is product of the digits of k.at n=31A178328
• Numbers k such that sigma(k) - k - 1 is a perfect number.at n=13A293992
• Expansion of 1/(1 - x * (1 + x^2)^3).at n=17A373718
• Number of compositions of 7*n-5 into parts 1 and 7.at n=7A373931