135431

Properties

Appears in sequences

• Number of ordered 5-tuples of integers from [ 1..n ] with no global factor.at n=25A015650
• Non-palindromic primes which on subtracting their reversal give perfect squares.at n=34A080177
• A 2nd-order recursion: a(1)=a(2)=1; a(n) = prime(a(n-1)) + primepi(a(n-2)) = A000040(a(n-1)) + A000720(a(n-2)).at n=10A082094
• Number of ternary words on {0,1,2} having no isolated 0's.at n=13A120925
• Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically.at n=23A258521
• Primes that can be generated by the concatenation in base 2, in descending order, of two consecutive integers read in base 10.at n=36A287019
• Prime numbersat n=12615