120121

Properties

Appears in sequences

• Primes formed by concatenating n with n+1.at n=17A030458
• Erroneous version of A134996.at n=10A038136
• Maximum cardinality of finite D0L sequence over an alphabet with n symbols.at n=48A039952
• Numbers whose base-7 representation has exactly 7 runs.at n=13A043622
• Primes whose decimal expansion is a concatenation of two or more consecutive increasing numbers (no leading zeros allowed).at n=18A052087
• Primes with 29 as smallest positive primitive root.at n=19A061733
• Smallest prime which leaves a remainder 1 when divided by primorial(n), i.e., when divided by first n primes.at n=5A073917
• Table read by rows where i-th row consists of primes P of the form P=j*P(i)# -1 or P=j*P(i)# +1 with 0 < j < P(i+1). Here P(r)# = A002110.at n=45A087715
• Smallest prime == 1 (mod (least common multiple of next n numbers)).at n=4A088107
• Primes whose decimal representation also represents a prime in base 3.at n=19A089981
• Primes from merging of 6 successive digits in decimal expansion of the Champernowne Constant.at n=11A104949
• Primes with maximal digit = 2.at n=33A106100
• Dihedral calculator primes: p, p upside down, p in a mirror, p upside-down-and-in-a-mirror are all primes.at n=11A134996
• Primes that are a concatenation of 2*k and 2*k+1 or 2*k and 2*k-1 for some k.at n=32A154530
• a(n) is the least prime number p such that every sum of two or more divisors of p^n is composite.at n=14A160994
• a(n) is the least prime number p such that every sum of two or more divisors of p^n is composite.at n=15A160994
• Palindromic primes in the sense of A007500 with digits '0', '1' and '2' only.at n=8A199302
• Primes of the form 7n^2 - 6.at n=13A201852
• Emirps that become their own reversals when rotated through 180 degrees (including on calculator display).at n=29A209620
• Concatenation of the decimal digits of n^2-1 and n^2.at n=11A215268