67158

Appears in sequences

• Smaller of unitary amicable pair.at n=6A002952
• Poincaré series [or Poincare series] (or Molien series) for mod 2 cohomology of universal W-group W(3).at n=24A014696
• Unitary amicable numbers.at n=12A063991
• Number of 5-tuples (v1,v2,v3,v4,v5) of nonnegative integers less than n such that v1 <= v4, v1 <= v5, v2 <= v4 and v3 <= v4.at n=12A085462
• Smaller member of an infinitary amicable pair.at n=15A126169
• Infinitary amicable numbers.at n=28A127664
• Sum of tetrahedral numbers A000292(k), with k in the reduced residue system modulo n.at n=38A189918
• a(n) = 3*binomial(8*n+3,n)/(8*n+3).at n=5A234462
• Smaller of bi-unitary amicable pair.at n=18A292980
• Lesser of semi-unitary amicable numbers pair: numbers (m, n) such that susigma(m) = susigma(n) = m + n, where susigma(n) is the sum of the semi-unitary divisors of n (A322485).at n=13A322541
• Lesser of modified exponential amicable pairs.at n=11A323758
• Lesser of tri-unitary amicable numbers pair: numbers (m, n) such that tsigma(m) = tsigma(n) = m + n, where tsigma(n) is the sum of the tri-unitary divisors of n (A324706).at n=12A324708
• a(n) is the smallest member of the n-th purely periodic unitary sigma aliquot cycle listed in A336216.at n=14A336219
• Numbers that are the sum of four third powers in nine or more ways.at n=34A345146
• Numbers that are the sum of four third powers in exactly nine ways.at n=19A345154
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/7)} a(7*k) * a(n-1-7*k).at n=37A386396