294001

Properties

Appears in sequences

• Weakly prime numbers (changing any one decimal digit always produces a composite number). Also called digitally delicate primes.at n=0A050249
• Consider 3 X 3 matrix M = [0 1 0 / 0 0 1 / 5 2 0]; a(n) = the center term in M^n * [1 1 1].at n=16A094248
• The 10^n-th irregular prime.at n=4A105463
• Weakly prime numbers (or isolated primes): changing any one decimal digit always produces a composite number, with restriction that first digit may not be changed to a 0.at n=0A158124
• a(n) = smallest member of the n-th term in S(10) (defined in Comments).at n=6A158578
• a(n) = largest member of the n-th term in S(10) (defined in Comments).at n=6A158579
• Numbers ending in 1, 3, 7 or 9 such that changing any one decimal digit produces a composite number.at n=1A186694
• Smallest weak prime in base n.at n=8A186995
• Primes p such that p^2 +- 12 and p^3 +- 12 are also primes.at n=3A263174
• a(n) is the smallest prime that becomes composite if any single digit of its base-n expansion is changed to a different digit (but not to zero).at n=8A323745
• Digitally delicate primes where the number of digits appended on the left needed to get a prime increases.at n=0A354440
• a(n) is the least number k whose digit sums are 2*n-1, 2*n and 2*n+1 in bases 2*n-1, 2*n and 2*n+1 respectively.at n=23A379896
• Prime numbersat n=25532