22113

Appears in sequences

• MacMahon's generalized sum of divisors function.at n=23A002128
• Odd numbers k that divide phi(k)*sigma(k).at n=20A015706
• Numerator of sum of -3rd powers of divisors of n.at n=33A017669
• a(n) is least k such that k and 5k are anagrams in base n (written in base 10).at n=22A023097
• Gaps of 9 in sequence A038593 (upper terms).at n=19A038658
• Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=20A046320
• Partial sums of A000340, second partial sums of A003462.at n=8A052150
• Number of (k,m,n)-multiantichains of multisets with k=3 and m=2.at n=5A084879
• a(1) = 1, a(2) = 2, next terms up to a(2n-1) are obtained by multiplying previous terms a(n-1) by n+1, a(n-2) by n+2 etc. a(2) by (2n-2) and a(1) by 2n-1. On similar lines a(2n) = 2n*a(2n-2), a(2n+1) = (2n+1)*a(2n-1) and so on.at n=38A109844
• a(n) = (n-1)*n*(n+1)*(n+2)*(2*n+1)/40.at n=13A112851
• Sum over all partitions of n of the sum of the parts that are smaller than the largest part.at n=23A116688
• Numbers n with property that average digit of n^2 is s=7.at n=20A164773
• Number of Golomb rulers of length n.at n=35A169942
• Vassiliev invariant of fourth order for the torus knots.at n=13A180324
• Number of (w,x,y,z) with all terms in {1,...,n} and w>=2x and y<3z.at n=18A212520
• Pairs of primitive deficient numbers having the same value of sigma(k)/k, listed by increasing value of the larger of the two k values.at n=8A212610
• Primitive deficient numbers n having a companion m > n such that sigma(n)/n = sigma(m)/m (ordered by increasing (smallest possible) m).at n=4A212611
• Sum of n consecutive cubes starting from n^3.at n=9A240137
• Prime factor look-and-say sequence starting with a(0) = 8.at n=3A253295
• Numerator of sigma_3(n)/sigma_2(n).at n=33A298754