293831

Properties

Appears in sequences

• Numbers k such that (11^k - 1)/10 is prime.at n=11A005808
• Number of nX3 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.at n=7A201534
• T(n,k) is the number of n X k 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.at n=47A201539
• Primes p such that 100p-1, 100p-3, 100p-7, and 100p-9 are all prime.at n=24A243409
• Prime numbersat n=25522