197137

Properties

Appears in sequences

• Primes of the form n^2*totient(n)+1 (or A053191(n) + 1).at n=22A076669
• Primes of the form 9*n^2 + 1.at n=22A156226
• Primes of the form p^2 + 2*p + 2 where p is prime.at n=23A157467
• Primes n of the form 1000p+q with primes p and q, 998>p>q>100.at n=30A228268
• Löschian numbers (A003136) of the form k^2+1.at n=33A271184
• Least positive squarefree integer k such that Q(sqrt(k)) has a class number greater than that of any previous integer.at n=17A279908
• Smallest prime p == 1 (mod 8) such that Q(sqrt(p)) has class number 2n+1.at n=32A355876
• Smallest p == 1 (mod 4) such that Q(sqrt(p)) has class number 2n+1.at n=32A355878
• Prime numbersat n=17747