77748

Appears in sequences

• 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=22A063964
• a(n) = Max { k>0 : denominator(S(k,2n+1)) } where S(k,s)=sum(i=1,k,i^s*H(i,2)) - H(k,2)*H(k,-s) and H(k,r)=sum(i=1,k,1/i^r) are the generalized harmonic numbers.at n=44A096442
• Conjectured list of fully multisociable numbers.at n=39A183029
• Numbers k such that A122111(k) [conjugated prime factorization of k] is one of Ore's Harmonic numbers (in A001599).at n=16A336317
• Numbers k such that abs(A328258(k)) = abs(A328258(k+1)).at n=40A348586
• Number k such that A033634(k) = A033634(k+1).at n=21A349224
• Let S(n)=sigma(n)/3. Numbers k such that S^m(k)=k, 1/3-sociable numbers (of any order).at n=15A356548