27501

Appears in sequences

• a(n) = (2*n+1)*(7*n+1).at n=44A033572
• Enneagonal numbers for which the product of the digits is also an enneagonal number.at n=29A117052
• Values of x in solutions (x,y,z) to the Diophantine equation x^3-x^2+y^3-y^2=z^3-z^2, with 1<x<y<z.at n=36A138667
• a(n) = 44*n^2 + 1.at n=25A158630
• Expansion of (1+3*x+9*x^2+9*x^3+9*x^4+3*x^5+x^6) /( (1+x)^2 * (1-x)^5 ).at n=16A175898
• a(n) = (35*n^4 - 105*n^3 + 160*n^2 - 120*n + 36)/6.at n=8A181342
• Compositions of n into parts 3, 5 and 7.at n=50A245367
• Numbers n which are both happy (A007770) and bihappy (A257795) numbers.at n=32A257950
• a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 2, a(1) = 0, a(2) = 2, a(3) = 1.at n=23A295689
• Indices n for which the partial sums of sin(k) (0 <= k <= n) reach a new minimum.at n=45A322288
• a(n) = (4*n^3 + 30*n^2 + 50*n)/3 + 1.at n=25A323218
• Number of achiral series-parallel networks with n elements and without multiple unit elements in parallel.at n=17A339293