26121388032
domain: N
Appears in sequences
- Ratios of successive terms are 2, 3, 2, 3, 2, 3, 2, 3, ...at n=27A026549
- a(n) = Sum_{k=0..2n} (k+1) * A026519(n, k).at n=23A027266
- a(n) = Sum_{k=0..2n} (k+1) * A026552(n, k).at n=23A027276
- a(n) = n*6^n.at n=12A036292
- Ninth column of triangle A067425.at n=7A067429
- a(n) = phi(6^n).at n=14A167747
- a(n) = phi(4^n-1), where phi is Euler's totient function (A000010).at n=17A295501
- a(n) = phi(8^n-1), where phi is Euler's totient function (A000010).at n=11A366654
- Numbers of the form P(k)^m * Q(k), k > 1, m >= 0, with P(k) = Product_{i=1..k} prime(i) = A002110(k) and Q(k) = Product_{j=1..k} P(j) = A006939(k).at n=22A387492
- Numbers of the form P(k)^m * Q(k), k > 1, m >= 1, with P(k) = Product_{i=1..k} prime(i) = A002110(k) and Q(k) = Product_{j=1..k} P(j) = A006939(k).at n=18A387493