131769

Appears in sequences

• Numbers of the form 3^i*11^j.at n=34A003597
• a(n) = (10*n + 3)^2.at n=36A017306
• a(n) = (11*n)^2.at n=33A017390
• a(n) = (12*n + 3)^2.at n=30A017558
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFI = ZSM-5 Nan[AlnSi96-nO192] starting with a T3 atom.at n=15A019160
• Numerators of squares of harmonic numbers A001008/A002805.at n=6A103930
• Squares of the form n+prime(n).at n=38A104992
• Numbers of the form (9^i)*(11^j), with i, j >= 0.at n=19A108687
• Squares of the form 2*prime(n) - prime(n+1).at n=37A110970
• Six-digit squares that are concatenation of two 3-digit primes.at n=3A153050
• Squares that become prime numbers when prefixed with an 8.at n=14A167723
• Numbers n such that tau(phi(n)) = sigma(rad(n)).at n=34A173745
• Squares n^2 that become prime after omitting all ones in their decimal expansion.at n=8A175983
• Numbers n of the form (product of divisors of k)/(sum of divisors of k) for some k.at n=4A187942
• Squares k such that gcd(sigma(k),usigma(k)) > 1, where usigma is A034448.at n=31A193003
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<2z.at n=22A212503
• Number of (2+1)X(n+1) 0..1 arrays with no element having a strict majority of its horizontal and antidiagonal neighbors equal to one.at n=8A231999
• Squares t^2 = (p+q+r)/3 which are the arithmetic mean of three consecutive primes such that p < t^2 < q < r.at n=2A234297
• Product of divisors of n / sum of divisors of n for n such that product of divisors of n is divisible by sum of divisors of n.at n=4A244670
• Numbers n such that for all divisors of n, ratios of 2 consecutive divisors of n will always reduce to lowest terms to a fraction with numerator=denominator+2.at n=30A280963