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Some convergent subseries of the harmonic series
Sudip Saha, , Bikash Chakraborty
Published in WORLD SCIENTIFIC PUBL CO PTE LTD
2023
Volume: 16
   
Issue: 04
Abstract
The harmonic series diverges. But, Kempner {[}A curious convergent series, Amer. Math Monthly 21 (1914) 48-50] proved that by removing those terms from the harmonic series whose denominators contain a digit 9 anywhere, the resulting sub-series converges. Thus, Kempner allowed no 9's at all, but in this short note, we allow 9's with some restrictions and without tampering the convergence of the resultant series. Some results of our note generalize a recent note of Mukherjee and Sarkar.
About the journal
JournalASIAN-EUROPEAN JOURNAL OF MATHEMATICS
PublisherWORLD SCIENTIFIC PUBL CO PTE LTD
ISSN1793-5571