A048541 a(n) is the smallest value of m such that A002378(m), the m-th oblong number, contains exactly n 6's.

2, 60, 257, 816, 4082, 77887, 258237, 816512, 4546060, 25820081, 103276578, 815209584, 816472087, 2581876578, 24834787435, 258140787487, 1239623599592, 7978512779247, 78515384904912, 121105886176546, 816494743559742, 6608227190863421, 8164653370882732, 81281404248860431, 81649676463937177

Offset: 1

Author

Patrick De Geest, May 15 1999

Keywords

• nonn
• base

Examples

			From _Jesse Sealand_, Oct 07 2019: (Start)
a(1) = 2 since A002378(2) = 6;
a(2) = 60 since A002378(60) = 3660;
a(3) = 257 since A002378(257) = 66306;
a(4) = 816 since A002378(816) = 666672, etc.
(End).
		

Links

• Eric Weisstein's World of Mathematics, Pronic Number

Crossrefs

Cf. A048542, A002378.

Cf. A048529, A048531, A048533, A048535, A048537, A048539, A048543, A048545, A048547.

Extensions

a(14)-a(16) from Lars Blomberg, Jun 10 2011

Name edited by Jesse Sealand, Oct 07 2019

a(17) from Giovanni Resta, Oct 09 2019

a(18)-a(25) from Max Alekseyev, Jul 25 2024