78888

Appears in sequences

• Terms of A001273 with trailing 9's stripped (at n=13 term becomes periodic with period 49).at n=9A018785
• Numbers having four 8's in base 10.at n=7A043524
• Numbers k such that k^7 - 1 and k^7 + 1 are semiprimes.at n=9A279272
• Triangle read by rows, T(n,k) = binomial(n, k)*hypergeom2F1(k - n, n + 1, k + 2, -2) for n >= 0 and 0 <= k <= n.at n=39A297704
• Numbers k such that A(k+1) = A(k) + 3, where A() = A005100() are the deficient numbers.at n=28A317046
• Square array read by antidiagonals downwards: for n >= 2, T(k,n) is the number of permutations of [k+n] that differ in every position from both the identity permutation and a permutation consisting of k 1-cycles and one n-cycle.at n=50A335391