36566

Appears in sequences

• Colored series-parallel networks.at n=7A001574
• Numbers k such that k and k+1 have same sum of divisors.at n=15A002961
• a(n) = Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; initial terms are 1,2,4.at n=17A049870
• Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=10A054007
• Numbers k such that sigma(k) divides sigma(k+1), where sigma(k) is sum of positive divisors of k.at n=28A058072
• Numbers k such that sigma(k+1) divides sigma(k), where sigma(k) is the sum of positive divisors of k.at n=35A058073
• Numbers k such that sigma(k)*omega(k) = sigma(k+1)*omega(k+1), where omega(k) is the number of distinct prime divisors of n (A001221).at n=10A063071
• Numbers k such that sopf(k) = sopf(k^2 - 1), where sopf(k) = A008472(k).at n=13A064019
• Numbers k such that 21^k + 2 is prime.at n=11A138049
• Numbers n such that sigma(n+1) - sigma(n) = k*n for some integer k, where sigma(n) = A000203 (sum of divisors of n).at n=23A223136
• Table of consecutive numbers with the same sum of divisors.at n=30A225757
• Column 3 of triangle in A059317 (the Pascal "Rhombus").at n=11A267192
• Numbers k such that s(k) = s(k+1), where s(k) is the sum of recursive divisors of k (A333926).at n=15A333949
• Numbers m such that the delta(m) = abs(sigma(m+1)/(m+1) - sigma(m)/(m)) is smaller than delta(k) for all k < m.at n=21A335071
• Numbers k such that A051378(k) = A051378(k+1).at n=15A349283