147454

Appears in sequences

• Numbers k such that 2*7^k - 1 is prime.at n=17A002959
• Numbers k such that k and k+1 have same sum of divisors.at n=29A002961
• Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=19A054007
• 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=34A063964
• Numbers k such that k and k+1 have the same sum of unitary and nonunitary divisors.at n=15A064729
• a(n) = 9*4^n - 2.at n=6A153465
• 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=16A171183
• a(n) = 9*2^n - 2.at n=14A176449
• 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=39A223136
• Numbers n such that floor(antisigma(n) / sigma(n)) = floor(antisigma(n+1) / sigma(n+1)).at n=21A244666
• 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=27A327875
• Numbers k such that s(k) = s(k+1), where s(k) is the sum of recursive divisors of k (A333926).at n=28A333949
• Number k such that A033634(k) = A033634(k+1).at n=31A349224
• Numbers k such that A051378(k) = A051378(k+1).at n=30A349283
• Numbers k such that sum of distinct primes dividing k is equal to the sum of proper divisors of k+1.at n=11A354603