61991

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of the function f(x) = 9x + 8.at n=19A023326
• Primes of the form n^2 - 10.at n=18A201313
• Primes of the form p^2 + q^2 + 21, where p and q are consecutive primes.at n=22A229075
• Numbers k such that (68*10^k + 7)/3 is prime.at n=33A270613
• The first of three consecutive primes the sum of which is equal to the sum of three consecutive squares.at n=11A298223
• Prime numbersat n=6232