7778777

Properties

Appears in sequences

• Primes that contain digits 7 and 8 only.at n=17A020470
• Smallest n-digit prime containing only the digits 7 and 8, or 0 if no such prime exists.at n=6A036949
• 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=27A077798
• Palindromic primes in which a single digit is sandwiched between strings of 7's.at n=9A088283
• Palindromic primes with digit sum = 50.at n=2A109207
• Primes p such that one digit appears exactly six times together with a single different digit.at n=28A257937
• a(n) = 7*(10^(2*n+1) - 1)/9 + 10^n.at n=3A332178
• Prime numbersat n=525832