79826

Appears in sequences

• Numbers k such that k and k+1 have same sum of divisors.at n=20A002961
• Numbers k such that sigma(k) = sigma(k+7).at n=26A015867
• Numbers n such that 83*2^n-1 is prime.at n=36A050567
• Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=13A054007
• Composite numbers k such that phi(k + d(k)) = phi(k) + d(k), where phi() = A000010(), d() = A000005().at n=28A063702
• 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=24A063964
• Numbers k such that k and k+1 have the same sum of unitary and nonunitary divisors.at n=9A064729
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.at n=11A148355
• G.f.: A(x) = exp( Sum_{n>=1} 2^n * x^n/(n*(1+x^n)) ).at n=17A165941
• 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=10A171183
• 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=28A223136
• Table of consecutive numbers with the same sum of divisors.at n=40A225757
• Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999).at n=37A293183
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) - b(n-2) + n, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=20A294423
• Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417).at n=40A306985
• 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=20A327875
• Numbers k such that s(k) = s(k+1), where s(k) is the sum of recursive divisors of k (A333926).at n=19A333949
• 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=26A335071
• Number k such that A033634(k) = A033634(k+1).at n=22A349224
• Numbers k such that A051378(k) = A051378(k+1).at n=20A349283