111031

Properties

Appears in sequences

• Indices of primes in sequence defined by A(0) = 11, A(n) = 10*A(n-1) + 21 for n > 0.at n=14A056244
• Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 1 or less and triangles differing by a constant counted only once.at n=4A195213
• T(n,k) is the number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by k or less and triangles differing by a constant counted only once.at n=14A195220
• Number of lower triangles of a 5 X 5 integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by n or less and triangles differing by a constant counted only once.at n=0A195223
• Primes which are the decimal concatenation of 1, a prime, and 1.at n=35A270237
• a(n) is the maximum prime factor of the concatenation of all the previous terms, with a(1)=1, a(2)=2.at n=7A280893
• Number of nonequivalent sets whose translations and reflections cover {1..n}.at n=19A329128
• Prime numbersat n=10538