188189

Properties

Appears in sequences

• Primes formed by concatenating n with n+1.at n=24A030458
• Primes whose decimal expansion is a concatenation of two or more consecutive increasing numbers (no leading zeros allowed).at n=25A052087
• Chen primes p such that p + 2 is triangular.at n=20A109504
• Primes of the form 5n^2 + 9.at n=27A201487
• Primes formed by concatenating n with n+1 and by concatenating n+2 with n+3.at n=7A256176
• Primes p such that d(p^2-1) sets a record, where d(n) is the number of divisors of n.at n=30A335325
• Irregular triangle where row n lists primes q below the n-th primorial such that the multiplicative order of q mod the n-th primorial is 2. I.e., such primes q having the least k such that q^k (mod primorial(n)) == 1 is 2.at n=43A336015
• Primes formed by the concatenation of exactly two consecutive composite numbers.at n=10A342049
• Primes of the form T(p) - 2 where T(p) is the triangular number (A000217) with prime index p in A357218.at n=29A357219
• a(n) is the smallest prime p such that tau(p^2 - 1) is equal to 2^n, where tau = A000005.at n=10A380798
• Prime numbersat n=17014