23424

Appears in sequences

• Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (4,k)-perfect numbers.at n=48A019293
• Number of partitions of n with equal nonzero number of parts congruent to each of 2 and 4 (mod 5).at n=50A035570
• Number of positions that are exactly n moves from the starting position in the Dino Cube puzzle.at n=4A079766
• Numbers that have exactly nine prime factors counted with multiplicity (A046312) whose digit reversal is different and also has 9 prime factors (with multiplicity).at n=1A109029
• Number of n X 3 1..2 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nonincreasing order.at n=49A166830
• E.g.f. satisfies: A'(x) = 1/(1 + x*A(x)) with A(0) = 1.at n=9A173895
• Numbers with prime signature {7,1,1}, i.e., of form p^7*q*r with p, q and r distinct primes.at n=30A179696
• Logarithms (cf. A179989) f:{1,...,n}->Z/nZ such that either (i) n is odd or (ii) n is even and f(m) is even whenever m divides n/2.at n=29A179990
• Number of -n..n arrays x(0..3) of 4 elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).at n=23A199911
• Number of (w,x,y) with all terms in {0,...,n} and 2*|w-x| > max(w,x,y) - min(w,x,y).at n=32A213045
• a(n) = sigma(2*n^3) - sigma(n^3).at n=21A225959
• Numbers n such that A277118(n) = 15.at n=6A277512
• Numbers k such that the product of their digits divides both k and R(k), where R(k) is the digits reverse of k.at n=35A277856
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 361", based on the 5-celled von Neumann neighborhood.at n=14A287789
• Numbers whose prime indices and prime signature have the same mean.at n=26A359903
• Number of integer partitions of n where the parts have lesser mean than the distinct parts.at n=38A360251