111506

Appears in sequences

• Numbers k such that k and k+1 have same sum of divisors.at n=25A002961
• Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=16A054007
• Numbers k such that k and k+1 have the same sum of squarefree divisors, or sqf(k) = sqf(k+1), where sqf(k) = A048250(k).at n=29A063964
• Numbers k such that k and k+1 have the same sum of unitary and nonunitary divisors.at n=12A064729
• Numbers k such that sigmawt(k) = sigmawt(k+1), where sigmawt(k) is the sum of the divisors of k weighted by divisor multiplicity in k.at n=13A171183
• 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=34A223136
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + b(n-2) + n + 1, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=19A294556
• Numbers k such that s(k) = s(k+1) where s(k) is the sum of unitary, squarefree divisors of k, including 1 (A092261).at n=23A327875
• Numbers k such that s(k) = s(k+1), where s(k) is the sum of recursive divisors of k (A333926).at n=25A333949
• 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=30A335071
• Number k such that A033634(k) = A033634(k+1).at n=27A349224
• Numbers k such that A051378(k) = A051378(k+1).at n=27A349283