90579

Appears in sequences

• a(n) is the smallest odd number that makes a(n)*2^N(n)-1 prime, where N(n) is the n-th Mersenne number that makes 2^N(n)-1 prime.at n=24A135434
• The number of 2 X 2 matrices with all eigenvalues real and whose entries are integers with absolute value at most n.at n=8A219736