30629

Appears in sequences

• Numbers whose base-5 representation contains exactly three 0's and three 4's.at n=26A045217
• Position where n (presumably) appears the last time in A107261, or 0 if n keeps appearing.at n=37A107262
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 0), (0, 0, 1), (1, 0, 1), (1, 1, -1)}.at n=8A150423
• Beach-Williams Pell numbers of type k^2 + 4.at n=9A212083
• Irregular triangular array: row n gives numbers D, each being the discriminant of the minimal polynomial of a quadratic irrational represented by a continued fraction with period an n-tuple of 1s and 3s.at n=22A246921
• Irregular triangular array: every periodic simple continued fraction CF represents a quadratic irrational (c + f*sqrt(d))/b, where b,c,f,d are integers and d is squarefree. Row n of this array shows the distinct values of d as CF ranges through the periodic continued fractions having period an n-tuple of 1s and 3s.at n=22A246922
• Composite numbers whose sum of aliquot parts divides the sum of their unrelated numbers.at n=10A250399
• Number of 4 X n binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.at n=18A266471
• Numbers k such that k![4] - 2 is prime, where k![4] = A007662(k) = quadruple factorial.at n=39A283554
• a(n) = (4*n^3 + 30*n^2 + 50*n)/3 + 1.at n=26A323218
• Semiprimes of the form k^2 + 4.at n=39A360741
• Numerators of the partial alternating sums of the reciprocals of the sum of bi-unitary divisors function (A188999).at n=21A379617