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A025622
Numbers of form 5^i*6^j, with i, j >= 0.
6
1, 5, 6, 25, 30, 36, 125, 150, 180, 216, 625, 750, 900, 1080, 1296, 3125, 3750, 4500, 5400, 6480, 7776, 15625, 18750, 22500, 27000, 32400, 38880, 46656, 78125, 93750, 112500, 135000, 162000, 194400, 233280, 279936, 390625, 468750, 562500, 675000
OFFSET
1,2
LINKS
FORMULA
Sum_{n>=1} 1/a(n) = (5*6)/((5-1)*(6-1)) = 3/2. - Amiram Eldar, Sep 25 2020
a(n) ~ exp(sqrt(2*log(5)*log(6)*n)) / sqrt(30). - Vaclav Kotesovec, Sep 25 2020
MATHEMATICA
n = 10^6; Flatten[Table[5^i*6^j, {i, 0, Log[5, n]}, {j, 0, Log[6, n/5^i]}]] // Sort (* Amiram Eldar, Sep 25 2020 *)
CROSSREFS
Cf. A000351 (subset), A000400 (another subset).
Sequence in context: A033042 A039594 A137080 * A116553 A249222 A034497
KEYWORD
easy,nonn
STATUS
approved