7519441

Appears in sequences

• Carmichael numbers that have only prime divisors of the form 10k+1.at n=13A212843
• Carmichael numbers k such that the odd part of k-1 is squarefree.at n=12A263403
• Carmichael numbers (A002997) that are the sum of two squares.at n=28A265237
• Primary Carmichael numbers.at n=18A324316
• Euler-Fibonacci pseudoprimes: odd composites k such that F(k) == 5^((k-1)/2) == +-1 (mod k), where F(k) = A000045(k), the Fibonacci numbers.at n=25A345753