72221

Properties

Appears in sequences

• Prime quadruples: numbers k such that k, k+2, k+6, k+8 are all prime.at n=30A007530
• Start of a string of exactly 4 consecutive (but disjoint) pairs of twin primes.at n=2A035792
• Primes at which the difference pattern X,2,4,2,Y (X and Y >= 6) occurs in A001223.at n=16A052165
• Twin primes belonging to packs of four or more twin pairs.at n=16A068220
• Lesser of the first pair of three successive prime pairs (no isolated primes occur in between). Least of the six successive primes which are member of prime pairs.at n=16A090953
• First of six consecutive primes that are three sets of twin primes.at n=15A136143
• First of eight consecutive primes that are four sets of twin primes.at n=2A136145
• Primes where the first digit equals the sum of all the other digits.at n=44A156307
• Prime numbers containing the string 222.at n=15A166580
• Larger of emirp pairs that are merely reversals of their end digits.at n=36A263242
• Primes p such that (p^1024 + 1)/2 is prime.at n=12A341272
• Prime numbersat n=7147