24056

Appears in sequences

• Convolution of A001950 with itself.at n=26A023667
• Least term in period of continued fraction for sqrt(n) is 10.at n=33A031434
• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 3.at n=16A049893
• Numbers n such that phi(n)=d_1!!*d_2!!*...*d_k!! where d_1 d_2 ... d_k is the decimal expansion of n.at n=15A139408
• a(n) = 729*n - 1.at n=32A158395
• a(n) = 961*n^2 + 31.at n=5A158675
• a(n) = 25*n^2 + n.at n=30A173089
• a(n) = 11*3^n-1.at n=7A198646
• Number of (w,x,y,z) with all terms in {1,...,n} and min{|w-x|,|w-y|}=min{|x-y|,|x-z|}.at n=24A212579
• Partial sums of phitorials: a(n) = A001088(1)+A001088(2)+...+A001088(n).at n=9A231721
• Numbers k such that card({x|sigma(x)=k}) > 1 and (Sum_{sigma(x)=k} x) < k.at n=29A258931
• Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west, northeast or southeast neighbor modulo 3 and the upper left element equal to 0.at n=12A267223
• "Erase or triple": list of the successive integers that produce the next "altitude" record (see the comments section).at n=8A300150
• Numbers k such that the determinant of the Vandermonde matrix of their digits is equal to phi(k), the Euler totient function of k.at n=13A307587
• Numbers k which have a factorization k = f1*f2*...*fr where the digits of {k, f1, f2, ..., fr} together give 0,1,...,9 exactly once.at n=23A370970
• Triangle read by rows: T(n,k) is the number of planar tanglegrams of size n with irreducible component of size k.at n=38A371659
• Numbers k which have a factorization k = f_1*f_2*...*f_r where f_i >= 1 and the digits of {k, f_1, f_2, ..., f_r} together give 0,1,...,9 exactly once.at n=39A372259