45349

Appears in sequences

• Numbers n such that 5*10^n + 7*R_n - 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=13A103020
• Brilliant numbers (A078972) whose digit reversal is the product of 2 palindromes greater than 1.at n=38A115681
• Recurrence sequence derived from the digits of the square root of 5 after its decimal point.at n=23A189893
• Numbers n such that there are a, b with abs(sigma(a) - sigma(b)) = sigma(n) - n and a U b = n, where U is decimal concatenation.at n=24A239563
• Number of horizontal steps in the peaks of all bargraphs having semiperimeter n (n>=2).at n=10A273720
• Expansion of 1/sqrt( (1-x) * (1-x-4*x^4) ).at n=23A383355