18090

Appears in sequences

• Numerators of continued fraction convergents to sqrt(906).at n=2A042750
• a(n) =(A001359[n]^2-1)/2.at n=17A117849
• Coefficient of x^2 in the polynomial (x-p(n))*(x-p(n+1))*(x-p(n+2))*(x-p(n+3)), where p(k) is the k-th prime.at n=14A127348
• Numbers n with following property: suppose n^6 = d1 d2 d3 ...dk in decimal; then d1! + d2! + ... + dk! is a square.at n=11A130688
• Row sums of triangle A132921.at n=19A132922
• Integers that do not have a partition into a sum of an odd square and two (not necessarily distinct) triangular numbers.at n=35A191764
• a(n) = (4*n+3)*(4*n+2).at n=33A256833
• Numbers equidistant from twin prime pairs that are also equidistant from numbers equidistant from twin prime pairs.at n=22A260517
• Numbers n such that both ceiling(sqrt(n)) and ceiling(n^(1/3)) divide n.at n=52A261417
• a(n) = 81*n^2 - 9*n.at n=15A277991
• Consider the graph with one central vertex connected to three outer vertices (a star graph). Then, a(n) is the minimum number of moves required to transfer a stack of n pegs from one outer vertex to another outer vertex, moving pegs to adjacent vertices, following the rules of the Towers of Hanoi.at n=39A291876
• a(n) = 108*n^2 - 228*n + 114 (n>=2).at n=12A304618
• Integral area of primitive integer-sided triangles whose sides a < b < c are in arithmetic progression.at n=42A351178
• Number of ordered pairs of distinct integer partitions of n.at n=14A355390
• Composite numbers with properties that its digits (which may appear with multiplicity) may not appear in any of its factors (wherein the digits may also appear with multiplicity) and the combined digits of the product and the factors must have at least one of each of the ten digits.at n=27A370972