222222227

Properties

Appears in sequences

• Smallest n-digit prime containing only digits 2 and 7, or 0 if no such prime exists.at n=8A036938
• Smallest prime containing exactly n 2's.at n=8A037057
• Smallest prime beginning with exactly n 2's.at n=8A065585
• Smallest prime starting with at least n 2s.at n=8A068103
• Smallest prime which is a concatenation of n primes.at n=8A069837
• Primes arising in A087605, or 0 if A087605(n) = 0.at n=7A087608
• Primes of the form identical digits followed by a 7.at n=22A090147
• Next prime associated with A091628.at n=7A091631
• Primes of the form 20*R_k + 7, where R_k is the repunit (A002275) of length k.at n=2A093167
• a(n) is the least prime following A002276(n) repdigits.at n=9A099656
• Near-repdigit primes with at least two 2's as the repeated digit.at n=6A105982
• Primes whose digits do not appear in two previous terms.at n=44A107798
• a(n) = (2*10^n + 43)/9.at n=8A173193
• Largest n-digit prime with the maximum number of digits equal to 2.at n=8A178000
• k-digit primes with the same even digit repeated k-1 times and a single odd digit.at n=36A320256
• Primes with digits in nondecreasing order, only primes, and with sum of digits also a prime.at n=32A343834
• Array read by downward antidiagonals: T(k,n) is the least number that has k prime factors (counted with multiplicity) and is the concatenation of n primes, or -1 if there is no such number.at n=36A374376
• Table T(n,k), 0 < n and 0 <= k < n, where the n-th row contains the smallest n-digit primes that remain prime even if any k of their digits are deleted, or -1 if no such prime exists.at n=41A378697
• Prime numbersat n=12238270