34688

Appears in sequences

• Numbers with digits nondecreasing and their reciprocals sum to 1/(positive integer).at n=30A045910
• Numbers k that divide sigma(k) + d(k), where d(k) is the number of divisors of k and sigma(k) is their sum.at n=11A056076
• Numbers m such that 2*m - sigma(m) is a divisor of m and greater than one, where sigma = A000203 is the sum of divisors.at n=17A060326
• Numbers such that harmonic mean of digits is 5.at n=10A062183
• Numbers k such that sigma(k) + tau(k) = 2k.at n=9A083874
• Numbers with digits in nondecreasing order such that sum of the reciprocals of the digits is 1.at n=13A091783
• Numbers n with digits in nondecreasing order such that sum of the reciprocal of digits is an integer.at n=36A091784
• Numbers of the form 2^n*(2^(n+1)+2n+1) where 2^(n+1)+2n+1 is prime.at n=5A105331
• Numbers k such that there is a number m < k satisfying A000203(k) = A000203(m) = m + k - gcd(m,k).at n=39A124141
• Numbers k whose abundance sigma(k) - 2*k = -16. Numbers k whose deficiency is 16.at n=10A125248
• a(n) = A152800(n+1,2n) for n>=0.at n=8A152801
• Number of trisubstituted linear alkanes of composition C_n H_(2n-1) XYZ.at n=20A159941
• Janet periodic table of the elements and structured hexagonal diamond numbers. a(n) = A166911(2*n) + A166911(2*n+1).at n=11A167471
• Number of (w,x,y) with all terms in {0,...,n} and w != min(|w-x|, |x-y|, |y-w|).at n=32A213492
• Numbers k such that if x = sigma(k) + tau(k) - k then k = sigma(x) + tau(x) - x.at n=23A238226
• Deficient-perfect numbers: Deficient numbers n such that n/(2n-sigma(n)) is an integer.at n=33A271816
• Numbers k such that sigma(k) == 0 (mod k-8).at n=20A274562
• Bi-unitary deficient-perfect numbers: bi-unitary deficient numbers k for such that 2*k - bsigma(k) is a bi-unitary divisor of k, where bsigma(k) is the sum of bi-unitary divisors of k (A188999).at n=33A303358
• Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and three equally spaced points along the diameter (a total of n+3 points). See Comments for precise definition.at n=28A333642