OFFSET
0,2
COMMENTS
a(n) is the smallest odd number with n distinct exponents in its prime factorization.
EXAMPLE
+---+-------------------------------+
| n | prime factorization of a(n) |
+---+-------------------------------+
| 1 | 3 |
| 2 | 3^2*5 |
| 3 | 3^3*5^2*7 |
| 4 | 3^4*5^3*7^2*11 |
| 5 | 3^5*5^4*7^3*11^2*13 |
| 6 | 3^6*5^5*7^4*11^3*13^2*17 |
| 7 | 3^7*5^6*7^5*11^4*13^3*17^2*19 |
+---+-------------------------------+
MATHEMATICA
Table[Product[Prime[k + 1]^(n - k + 1), {k, 1, n}], {n, 0, 11}]
PROG
(PARI) a(n) = prod(k=1, n, prime(k+1)^(n-k+1)); \\ Altug Alkan, Apr 02 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ilya Gutkovskiy, Apr 02 2018
STATUS
approved