A048542 Smallest oblong (promic) number containing exactly n 6's.

6, 3660, 66306, 666672, 16666806, 6066462656, 66686606406, 666692662656, 20666666069660, 666676608666642, 10666051666666662, 664566666660662640, 666626669666607656, 6666086666606866662, 616766666966468666660, 66636666164666636562656, 1536666668666666766166056

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Eric Weisstein's World of Mathematics, Pronic Number

Crossrefs

Cf. A048541, A002378.

Cf. A048530, A048532, A048534, A048536, A048538, A048540, A048544, A048546, A048548.

Sequence in context: A198625 A198653 A198660 * A140173 A158663 A110106

Adjacent sequences: A048539 A048540 A048541 * A048543 A048544 A048545

Keyword

nonn,base

Author

Patrick De Geest, May 15 1999

Extensions

a(14)-a(17) from Giovanni Resta, Oct 09 2019

Status

approved