182910

Appears in sequences

• Numbers k such that k^2 +- k +- 1 is prime for all four possibilities.at n=25A236056
• Unitary barely 3-deficient numbers: numbers m such that usigma(k)/k < usigma(m)/m < 3 for all numbers k < m, where usigma is the sum of unitary divisors function (A034448).at n=7A336672
• Products of 6 distinct primes that are sandwiched between semiprime numbers.at n=19A378627