21925

Appears in sequences

• Gaps of 6 in sequence A038593 (lower terms).at n=6A038651
• a(n) = n^3 - n + 1.at n=28A061600
• Braided power sequence: A065692 is b(n+1) = 3*b(n) + 2*d(n) - c(n), this is c(n+1) = 3*c(n) + 2*b(n) - d(n) and A065694 is d(n+1) = 3*d(n) + 2*c(n) - b(n), starting with b(0) = 0, c(0) = 1 and d(0) = 2.at n=7A065693
• The last number for which a determinant of base-n numbers is nonzero.at n=26A079505
• Number of 4 X 4 magic squares with line sum n.at n=8A093199
• 75-gonal numbers: a(n) = n*(73*n-71)/2.at n=25A098230
• Quadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers.at n=19A139783
• Partial sums of A138202.at n=27A164940
• Partial sums of A138202.at n=28A164940
• Position of 3^n in A051037 (5-smooth numbers).at n=48A188426
• a(n) = 3*a(n-1) - 2*a(n-2) - a(n-4) + a(n-5) with initial terms 1, 1, 1, 3, 6.at n=17A196787
• Number of length 4+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.at n=37A248437
• Sums of Pythagorean sextuples in increasing order: The sums of sets of six natural numbers which correspond to the lengths of the edges of a tetrahedron whose four faces are all different Pythagorean triangles.at n=37A248548
• Expansion of Product_{k>=1} (1-x^k)*(1+x^k)^4.at n=27A261998
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 329", based on the 5-celled von Neumann neighborhood.at n=32A271275
• Expansion of Product_{k>=1} 1/(1 - k*x^(k^2)).at n=48A285245