67628

Appears in sequences

• Number of subsets of the first n numbers having a common divisor greater than 1.at n=32A109511
• The number of unlabeled graphs on n nodes with degree of 1 or 2.at n=36A186417
• Number of nXnXn triangular 0..3 arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value.at n=8A215177
• Number of possibilities of getting a prime sum when rolling n six-sided dice.at n=7A224397
• Numbers k such that if x = sigma(k) + tau(k) - k then k = sigma(x) + tau(x) - x.at n=30A238226
• a(n) = 4*n*(21*n - 26).at n=29A263229
• Number of n X 2 0..1 arrays with no element unequal to a strict majority of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.at n=20A280227
• a(n) = (1/24)*(n + 3)*(3*n^3 + 5*n^2 - 6*n + 16).at n=25A290061
• Lesser members of dihedral amicable pairs: numbers (m, k) such that t(m) = t(k) = m + k, where t(k) = sigma(k) + d(k).at n=10A320457
• Numbers k whose trajectory under the Reverse and Add! operation carried out in base 16 does not reach a palindrome and (presumably) does not join the trajectory of any term m < k.at n=29A344119
• Number of incomplete integer partitions of n, meaning not every number from 0 to n is the sum of some submultiset.at n=52A365924