77779

Appears in sequences

• Differences between two positive cubes in exactly 2 ways.at n=33A014440
• Difference between two positive cubes in more than one way.at n=35A034179
• Square root of n has the same nonzero digit in each of the first 4 places to the right of the decimal point.at n=29A073585
• a(n) = 81*n^2 - 2*n.at n=30A157507
• a(n) = (7*10^n + 11)/9 for n > 0.at n=4A173808
• Composite numbers such that every non-identity permutation gives a prime.at n=27A225193
• Look at the set of numbers obtained by permuting the digits of n in all possible ways, then remove n itself from the set. If the remaining numbers are all primes, then n is in the sequence.at n=44A272022
• Numbers k such that k![4] + 2 is prime, where k![4] = A007662(k) = quadruple factorial.at n=49A283553
• Numbers with digits 7 and 9 only.at n=31A285011
• Sum of two (possibly negative) coprime cubes in at least 2 ways, but not the sum of 2 noncoprime cubes.at n=34A293648