3090091

Appears in sequences

• Strong pseudoprimes (base 2) that become prime when two is subtracted.at n=16A230483
• Strong pseudoprimes k to base 2 such that either k-2 or k+2 is prime.at n=23A230487
• Composite numbers n such that n == 3 (mod 8) and 2^((n-1)/2) == -1 (mod n).at n=10A244628
• Fermat pseudoprimes (A001567) that are the sum of three consecutive primes.at n=18A270639
• Composite numbers k == 3 (mod 4) such that (1 + i)^k == 1 - i (mod k), where i = sqrt(-1).at n=24A270697