21311

Appears in sequences

• Denominators of continued fraction convergents to sqrt(219).at n=8A041409
• a(n) = 576*n - 1.at n=36A158372
• Composite numbers whose product of digits is 6.at n=32A201055
• Numbers that eventually reach 1 under "x -> sum of 4th power of digits of x".at n=19A219111
• a(n) is the positive integer x such that 3^((M-1)/(2*p)) == -2^x (mod M), where p > 2 is prime, M=2^p-1 is the n-th Mersenne prime and x < p.at n=24A278792
• Numbers k such that (3^ord(3/2, k) - 2^ord(3/2, k))/k is a prime, where ord(3/2, k) is the multiplicative order of 3/2 (mod k).at n=24A345705