A108201 Numbers of the form (5^i)*(12^j), with i, j >= 0.

1, 5, 12, 25, 60, 125, 144, 300, 625, 720, 1500, 1728, 3125, 3600, 7500, 8640, 15625, 18000, 20736, 37500, 43200, 78125, 90000, 103680, 187500, 216000, 248832, 390625, 450000, 518400, 937500, 1080000, 1244160, 1953125, 2250000, 2592000

Offset

1,2

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

Sum_{n>=1} 1/a(n) = 15/11. - Amiram Eldar, Mar 29 2025

Mathematica

Take[Union[5^First[#] 12^Last[#]&/@Tuples[Range[0, 20], 2]], 50] (* Harvey P. Dale, Mar 23 2012 *)

Crossrefs

Cf. A025622, A003595, A025623, A025624, A025625, A003598, A107466, A064476.

Sequence in context: A331714 A086168 A301748 * A289586 A223233 A038254

Adjacent sequences: A108198 A108199 A108200 * A108202 A108203 A108204

Keyword

nonn,easy

Author

Douglas Winston (douglas.winston(AT)srupc.com), Jun 15 2005

Status

approved