81019

Properties

Appears in sequences

• Upper twin primes of upper twin prime index.at n=35A088463
• Floor-Sqrt transform of Catalan numbers (A000108).at n=20A186546
• Primes obtained from other primes by prefixing an 8.at n=40A290407
• Number of nX5 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=6A298393
• Number of nX7 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=4A298395
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.at n=59A298396
• Primes p such that A001177(p) = (p-1)/9.at n=24A308802
• Prime numbersat n=7929