21558

Appears in sequences

• Powers of fifth root of 5 rounded down.at n=31A018126
• Powers of fifth root of 5 rounded to nearest integer.at n=31A018127
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFS = ZSM-57 H1.5[Al1.5Si34.5O72] starting with a T3 atom.at n=13A019171
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,27.at n=8A064250
• Row sums of the number triangle A098505.at n=17A098506
• Numbers n such that 9*10^n + 4*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=8A103098
• a(1)=1; a(n) is the smallest integer > a(n-1) such that the largest element in the simple continued fraction for S(n)=1/a(1)+1/a(2)+...+1/a(n) equals 3^n.at n=5A109677
• Number of (n+1) X 5 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively.at n=14A204647
• The Wiener index of the nanostar dendrimer G[n], defined pictorially in the Karbasioun-Ashrafi reference.at n=0A221002
• Total sum of parts of multiplicity 9 in all partitions of n.at n=43A222737
• The Wiener index of the nanostar dendrimer NS_2[n], defined pictorially in the A. R. Ashrafi et al. reference.at n=2A224452
• Partial sums of A253088.at n=32A255048
• Numbers k > 0 such that either 3*k+4, k-2, k+2, n+k or 3*k+5, k-1, k+1, k+5 are all primes.at n=48A290130
• Expansion of Sum_{k>=0} x^k / Product_{j=1..k} (1 + j*x^j).at n=31A306702
• Numbers with arithmetic derivative which is a palindromic prime number (A002385).at n=36A359332
• Number of integer partitions of n with different mean, median, and mode.at n=41A363720