234512

Appears in sequences

• Number of trees on n nodes with 3 forbidden limbs of size 4, 5 and 6.at n=17A014278
• a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3, 4, 5 (and repeat).at n=23A165303
• a(n) = n^4 * Sum_{p|n, p prime} 1/p^4.at n=43A351244