208889

Properties

Appears in sequences

• Common factors of 2^p-1 and the p-th Fibonacci number, p prime.at n=12A080051
• Lesser of twin primes p1 such that p1^3 + p2^2 are average of twin primes. p1 and p2 twin primes, p1 < p2.at n=24A139778
• Number of n X n binary arrays with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.at n=7A146006
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.at n=17A146008
• Prime numbersat n=18709