23370

Appears in sequences

• a(n) is a non-palindromic composite located between twin primes whose reverse, which is less than it, is also located between twin primes.at n=17A103741
• Numbers m such that m^4-1 has no divisors d with 1 < d < m-1.at n=41A129293
• The maximum integer dimension in which the volume of the hypersphere of radius n remains larger than 1.at n=36A177677
• a(n) = 14*n^2 - 4*n.at n=41A195023
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 182", based on the 5-celled von Neumann neighborhood.at n=38A270632
• Nonprime numbers k such that the sum of the divisors of k^2 is of the form m^2 + m + 1.at n=30A289385
• a(n) = (2*n-3-(-1)^n)*(22*n^2-21*n+5*n*(-1)^n)/96.at n=37A298992
• Perimeters of more than one primitive 120-degree integer triangle.at n=15A350047
• Products of 5 distinct primes that are sandwiched between twin prime numbers.at n=14A376380