812849

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=30A023302
• Initial (unsafe) primes of Cunningham chains of first type with length exactly 5. Primes in A059453 that survive as primes just four "2p+1 iterations", forming chains of exactly 5 terms.at n=21A059764
• Number of 8 X n binary arrays with a path of adjacent 1's from top row to bottom row.at n=2A069366
• Number of n X 3 binary arrays with a path of adjacent 1's from top row to bottom row.at n=7A069378
• Primes p such that 2p+1, 4p+3, 6p+5, 8p+7 are all primes.at n=26A107021
• Array read by antidiagonals: T(m,n) is the number of m X n binary arrays with a path of adjacent 1's from top row to bottom row.at n=52A359576
• Array read by antidiagonals: T(m, n) is the number of m X n binary arrays with a path of adjacent 1's from top row to bottom row using only left, right, and downward steps.at n=52A369892
• Prime numbersat n=64896