Are you talking about ekōnavimśati = ēka + ūna +  vimśati ? = 19 

On Sat, Jul 27, 2019 at 11:16 PM François Patte via INDOLOGY <indology@list.indology.info> wrote:
Bonjour,

There is a construction ablative + na with numerals:
ekān na viṃśatiḥ for 19

Is this kind of construction exists in other circumstances? And, if yes,
what is the meaning?

I came accross this sentence:

tena ṛṣabhān na prastāraḥ

which comes as a conclusion after:

tata ṛṣabhasya adhastāt ṣaḍjo deyatvenāsīt। sa copary agre vartate।
(tena ṛṣabhān na prastāraḥ |)

Thank you for some lights...

--
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)6 7892 5822
http://www.math-info.univ-paris5.fr/~patte

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Nagaraj Paturi
 
Hyderabad, Telangana, INDIA.


Director,  Inter-Gurukula-University Centre for Indic Knowledge Systems. 
BoS, MIT School of Vedic Sciences, Pune, Maharashtra

BoS, Chinmaya Vishwavidyapeeth, Veliyanad, Kerala

Former Senior Professor of Cultural Studies
 
FLAME School of Communication and FLAME School of  Liberal Education,
 
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