27469

Appears in sequences

• Number of permutations of length n which avoid the patterns 1234, 2143, 3421.at n=29A116842
• 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, 1), (-1, 1, 0), (0, 0, -1), (1, 0, 0), (1, 0, 1)}.at n=8A150348
• Numbers with all different digits such that each digit leaves the same nonzero remainder when each is divided into the number.at n=13A152852
• Number of third differences of arrays of length 5 of numbers in 0..n.at n=27A228261
• Odd composite numbers n, such that n, n+d, n*d and n/d are all odious (A000069) for every divisor d of n.at n=39A231558
• a(n) = n + floor( n^2/2 + n^3/3 ).at n=43A236773
• G.f. = b(2)^2*b(4)/(2*x^5+x^4-2*x^3-x^2-x+1), where b(k) = (1-x^k)/(1-x).at n=15A266370
• Number of maximal product-free subsets of {1..n}.at n=48A326496
• Number of maximal sum-free and product-free subsets of {1..n}.at n=38A326497
• Odd composite numbers k all of whose divisors larger than 1 are not binary palindromes (A006995) such that the divisors of the binary reversal of k (A030101) are the binary reversals of the divisors of k.at n=7A331664