136500

Appears in sequences

• Infinitary harmonic numbers: harmonic mean of infinitary divisors is an integer.at n=20A063947
• 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), (0, 0, 1), (0, 1, -1), (1, 0, 1), (1, 1, 1)}.at n=8A151221
• Molecular topological indices of the Moebius ladders.at n=34A192833
• Integer areas of the Lucas Central triangles of integer-sided triangles.at n=8A231739
• Bi-unitary harmonic numbers.at n=26A286325
• Number of nonisomorphic proper colorings of partition star graph using six colors.at n=47A297570
• a(n) = (n+2)*(n+1)*(n^6-12*n^5+70*n^4-210*n^3+409*n^2-378*n+360)/720.at n=11A302644
• Tri-unitary harmonic numbers: numbers k such that the harmonic mean of the tri-unitary divisors of k is an integer.at n=21A335387
• Infinitary arithmetic numbers k whose mean infinitary divisor is an infinitary divisor of k.at n=10A361387
• Bi-unitary arithmetic numbers k whose mean bi-unitary divisor is a bi-unitary divisor of k.at n=14A361787
• Expansion of e.g.f. exp( Sum_{k>=0} x^(3*k+2) / (3*k+2)! ).at n=13A365338