A048538 Smallest oblong (promic) number containing exactly n 4's.

42, 4422, 46440, 464442, 44642442, 144444342, 40447444340, 2344449414440, 42794944444440, 443448440044440, 24442434644444460, 455758444444444440, 34444442714441644442, 44441704844441444442, 14444904404444444646450, 344407444483444494444942, 1244444414842444444444506

Offset: 1

Author

Patrick De Geest, May 15 1999

Keywords

• nonn
• base

Links

• Eric Weisstein's World of Mathematics, Pronic Number

Crossrefs

Cf. A048537, A002378.

Cf. A048530, A048532, A048534, A048536, A048540, A048542, A048544, A048546, A048548.

Extensions

a(13)-a(17) from Giovanni Resta, Oct 09 2019