61035155

Appears in sequences

• a(0) = 0; a(n) = 5*a(n-1) + 5.at n=11A104891
• a(1)=1, a(n) = a(n-1) + (p-1)*p^(n/2-1) if n is even, otherwise a(n) = a(n-1) + p^((n-1)/2), where p=5.at n=21A133629
• Numbers of the form p*q, where p is prime and q=(p^k-1)/(p-1) is also prime for some integer k>1.at n=28A330832
• Nonprime-powers k such that, for any prime p dividing k and m = 1+floor(log k/log p), rad(p^m (mod k)) divides k, where rad = A007947.at n=37A381750
• Numbers k in A024619 such that all residues r (mod k) in row k of A381801 are such that rad(r) divides k, where rad = A007947.at n=30A382438