5148001

Appears in sequences

• Carmichael numbers that have only prime divisors of the form 10k+1.at n=10A212843
• Carmichael numbers (A002997) that are the sum of two squares.at n=21A265237
• Numbers that are both Fermat pseudoprimes to base 2 (A001567) and Bruckman-Lucas pseudoprimes (A005845).at n=26A329240
• Carmichael numbers k for which A053575(k) [the odd part of phi] divides k-1.at n=11A339869
• 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=20A345753
• Carmichael numbers k such that k-1 is a Novak-Carmichael number.at n=15A375322