147455

Appears in sequences

• Lucas-Carmichael numbers: squarefree composite numbers k such that p | k => p+1 | k+1.at n=29A006972
• Convolution of (F(2), F(3), F(4), ...) and primes.at n=19A023657
• a(n) = T(2, n), where T is the array given by A047858.at n=14A047859
• Expansion of (1+x^2-x^3)/((1-x)*(1-2*x)).at n=16A052996
• Numbers m such that m = 2*sigma(m)/3 - 1.at n=5A063906
• Composite k such that (k+1) * Sum_{d|k} d/sigma(d) is an integer.at n=26A068975
• a(1) = 2, a(n+1) = smallest squarefree number == 1 (mod a(n)) and > a(n).at n=17A076698
• a(n) = 9*4^n - 1.at n=7A114569
• Number of proper divisors of the Catalan number A000108(n).at n=43A153788
• Composite numbers in A182140 but not in A071700.at n=4A182221
• Lucas-Carmichael numbers with 4 prime factors.at n=8A216926
• Numbers k that divide sigma(k) - sigma(k-1).at n=37A227307
• Numbers k such that sigma(k) = sigma(k-1).at n=29A231546
• G-Lehmer numbers: Composite numbers k such that A060968(k) divides A201629(k).at n=15A235864
• Numbers m such that floor(antisigma(m) / m) = antisigma(m) mod m.at n=13A244324
• Record values in A135141.at n=31A246347
• Decimal representation of the n-th iteration of the "Rule 125" elementary cellular automaton starting with a single ON (black) cell.at n=9A267360
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 305", based on the 5-celled von Neumann neighborhood.at n=19A280976
• 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 467", based on the 5-celled von Neumann neighborhood.at n=21A288442
• Lucas-Carmichael numbers of the form k^2 - 1.at n=4A292538