359719

Properties

Appears in sequences

• Primes which are the concatenation of a Sophie Germain prime p and 2p+1.at n=6A168165
• Primes which are the concatenation of a prime p and 2p+1.at n=19A168166
• a(n) is the number of 2 X 2 matrices with entries in {1, ..., n} that are not the product of two 2 X 2 positive integer matrices.at n=26A260550
• Prime numbersat n=30743