25389

Appears in sequences

• Expansion of 1/((1-2x)(1-5x)(1-6x)(1-7x)).at n=4A025986
• Denominators of continued fraction convergents to sqrt(235).at n=5A041439
• Denominators of continued fraction convergents to sqrt(940).at n=11A042819
• Partial sums of A051797.at n=11A051878
• 9 times octagonal numbers: a(n) = 9*n*(3*n-2).at n=31A064201
• Group the natural numbers >= 1 so that the n-th group contains n(n+1)/2 numbers and obtain the group sum.at n=11A095166
• a(n) = (n+1)(n+2)(n+3)(9n^2 + 26n + 20)/120.at n=11A110159
• Number of permutations of length n which avoid the patterns 1234, 2143, 3421.at n=28A116842
• Numbers n such that n^6 + 272 is prime.at n=36A161998
• The number of 4321-avoiding separable permutations of length n.at n=10A165521
• Numbers n with property that n and 2n are sums of two distinct positive cubes.at n=12A191345
• Integers n such that each of n, 2n and 3n is a sum of 2 distinct positive cubes.at n=3A191383
• Pairs of deficient numbers having the same value of sigma(k)/k in the order that they are found.at n=15A211680
• The larger companion to the deficient numbers in A212608.at n=7A212609
• The Wiener index of the cyclic phenylene with n hexagons (n>=3).at n=10A224456
• Number of length 6 1..(n+2) arrays with no leading or trailing partial sum equal to a prime.at n=7A254209
• a(n) = n*(n + 5)*(n + 10)*(n + 15)/24.at n=21A264446
• Row 5 of A277710: Positions of 5's in A264977; positions of 10's in A277330.at n=45A277715
• Composite numbers whose sum of aliquot parts divide the sum of the squares of their aliquot parts.at n=42A301482
• Indices k at which record low values of the ratio A046530(k)/k occur.at n=29A330695