24751

Appears in sequences

• a(n+2) = 3*a(n) - a(n-2) with a(0) = 1, a(1) = 3, a(2) = 6.at n=16A018186
• Denominators of continued fraction convergents to sqrt(93).at n=11A041167
• Partial sums of A068058 + 1.at n=45A068059
• a(n) = least k such that the remainder when 7^k is divided by k is n.at n=37A119715
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (1, -1, -1), (1, 0, 0), (1, 1, 1)}.at n=8A150356
• Numbers k such that k-1 and k+1 are each the product of exactly 7 primes, counted with multiplicity.at n=6A157487
• Numbers k such that 17 is the largest prime factor of k^2 - 1.at n=40A181452
• a(1)=3, a(2)=1, a(n) = 3*a(n-1) + a(n-2).at n=9A189735
• Numbers m>=2, such that, if a prime p divides m^2-1, then every prime q<p divides m^2-1 as well.at n=24A194099
• Number of -n..n arrays x(0..3) of 4 elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.at n=24A199899
• Number of nX6 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=4A303180
• T(n,k) = Number of n X k 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=49A303182
• Number of 5Xn 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=5A303185
• Trajectory of n under the Reverse and Add! operation carried out in base 8 (presumably) does not reach a palindrome and (presumably) does not join the trajectory of any term m < n.at n=31A306596
• Integers k such that the number of divisors of k^2 - 1 (A347191) sets a new record.at n=30A347192
• Numbers k such that A353802(k) / sigma(sigma(k)) is an integer > 1, where A353802(n) = Product_{p^e||n} sigma(sigma(p^e)).at n=14A353807
• Centered pentagonal numbers which are squarefree semiprimes.at n=34A381043
• Centered pentagonal numbers which are semiprimes.at n=35A382132