29029

Appears in sequences

• Odd integers m such that phi(m) | sigma(m).at n=16A015715
• Partial sums of A051879.at n=9A050405
• Rhombi (in 3 different orientations) in a rhombus with 60-degree acute angles.at n=41A052153
• Numbers n such that sigma(n) = 2*phi(n).at n=4A062699
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=13A068400
• Numbers n such that sigma(n) = phi(3n).at n=10A074891
• Numbers k such that both k and 2*k are balanced numbers (A020492).at n=25A076375
• Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).at n=10A076376
• Squarefree balanced numbers (i.e., squarefree members of A020492).at n=43A078557
• Numbers whose name in American English is a word-palindrome, reading the same forward and backward.at n=37A081365
• Balanced numbers (A020492) k such that k mod 12 = 1.at n=2A110597
• a(n) = 9 + floor((3 + Sum_{j=1..n-1} a(j))/4).at n=36A120167
• Table of Encoded Bell Multisets using A064553 (cf. A129305).at n=32A130274
• Derived from the centered polygonal numbers: start with the first triangular number, then the sum of the first square number and the second triangular number, then the sum of first pentagonal number, the second square number and the third triangular number, and so on and so on...at n=26A141534
• a(n) = core(A143176(n)).at n=57A144362
• a(n) = A008893(n)/2.at n=13A152041
• a(n) = 1001*n.at n=28A153814
• The Wiener index of the P_3 X P_n grid, where P_m is the path graph on m nodes. The Wiener index of a connected graph is the sum of distances between all unordered pairs of nodes in the graph.at n=25A180569
• Antidiagonal sums of the convolution array A213561.at n=10A213563
• Numbers k such that gcd(sigma(k), phi(k)) (A009223) attains record values.at n=27A222711