77688

Appears in sequences

• Coordination sequence for E_6 lattice.at n=5A008399
• Least number that ends an arithmetic progression of n numbers with distinct prime signatures.at n=15A113462
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives y numbers.at n=13A125491
• Greater of friendly pairs where both terms belong to A014574.at n=4A216058
• Sum of the divisors of n^3 - 1.at n=29A234860
• sigma(n) is an additive inverse of n modulo phi(n).at n=20A235989
• Square array A(1,k) = A265905(k), A(n>1,k) = A(n-1, k+1) - A(n-1, k); successive differences of A265905 read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...at n=33A275950
• Transpose of array A275950.at n=30A275951
• Let p = n-th prime == 3 mod 8; a(n) = (sum of quadratic residues mod p that are < p/2) + (sum of all quadratic residues mod p).at n=24A282727
• Members of A014574 with sum of prime factors (with multiplicity) also in A014574.at n=44A349455