7772777

Properties

Appears in sequences

• Primes that contain digits 2 and 7 only.at n=27A020459
• Palindromic primes with just two distinct prime digits.at n=20A058375
• Smallest prime beginning and ending in at least n 7's.at n=2A068162
• Palindromic wing primes (a.k.a. near-repdigit palindromic primes) of the general form r*(10^d - 1)/9 + (m-r)*10^floor(d/2) where d is the number of digits (an odd number > 1), r is the repeated digit, and m (different from r) is the middle digit.at n=25A077798
• Smallest palindromic prime containing exactly n 7's.at n=5A083978
• Palindromic primes in which a single digit is sandwiched between strings of 7's.at n=7A088283
• a(n) = smallest palindrome > a(n-1) (for n > 0) such that the sum of its prime digits is equal to palindrome with index n, or -1 if none exists.at n=13A114996
• Primes p such that one digit appears exactly six times together with a single different digit.at n=25A257937
• a(n) = 7*(10^(2*n+1) - 1)/9 - 5*10^n.at n=3A332172
• Prime numbersat n=525454