The entry on the list
The Pi World Ranking List is a single long table of verified recitations, ordered by the number of decimal places a person has produced from memory. Mamta Koona appears on it at rank 31, with 10,400 digits, dated 13 February 2016.
A ranking table of this kind is unusually literal evidence. It does not paraphrase, interpret or profile. It states a name, a country, a figure and a date, and it places that line above some entries and below others. Everything this page can responsibly say about Koona's achievement is contained in those four values and in what the rest of the table shows around them.
What 10,400 digits means in the table
The top of the list is held by Suresh Kumar Sharma of India with 70,030 digits, recited on 21 October 2015, followed by Rajveer Meena, also of India, with 70,000 on 21 March 2015, and Chao Lu of China with 67,890 on 20 November 2005. Fourth and fifth are Sudhir Dwivedi with 45,000 and Krishan Chahal with 43,000, both Indian.
Against that ceiling, 10,400 digits is a fraction of the leading totals and still far beyond ordinary recall. Most people can hold seven or eight digits in working memory without training. A five-figure recitation belongs to a different activity altogether: an attempt of this size takes hours to deliver aloud and months of systematic encoding to prepare.
An Indian discipline
Four of the five highest entries on the list are Indian, and the two largest totals ever recorded on it were set in India within seven months of each other in 2015. Pi recitation in India is not a curiosity practised in isolation; it is a competitive tradition with a visible pipeline of attempts and a public table to measure them against.
Koona's entry sits inside that tradition. Her attempt came in February 2016, a few months after Sharma's record-setting recitation, at a point when the discipline in India was drawing more attention than at any time in its history.
What the list records, and what it withholds
The list is a table of results, not a register of people. It carries no ages, no home towns, no schools, no photographs, and no account of how any individual entrant prepared. For most of the names on it, including Koona's, the line in the table is the only published record that a search will return.
The page as read for this article also does not set out its own verification rules, so the procedure that stands behind the figure of 10,400 is not described here. What can be said with confidence is that the entry exists, that it is dated, and that it is placed in an order that thousands of readers use as the reference standard for the discipline.
Why pi, and why it keeps drawing attempts
Pi is the ideal material for a memory contest because it is infinite, non-repeating and universally known. There is no shortcut, no mnemonic pattern hiding in the sequence, and no ambiguity about whether a digit is right. Every attempt is auditable against the same numbers, which is why a simple ranked list can serve as the sport's scoreboard.
That combination — infinite supply, objective marking, no equipment — keeps the discipline open to anyone willing to do the work, and it is why the table continues to grow from countries with no formal memory-sport infrastructure. Koona's 10,400 digits is one line in that record, precisely dated and independently listed.
| 人物 | 国家 | 里程碑 | 年龄 / 数据 |
|---|---|---|---|
| Gaurav Raja | 美国 | 15岁时背诵10,980位圆周率 | 15岁 |
| Mamta Koona | 印度 | 背诵10,400位圆周率 | — |
| Sudhir Dwivedi | 印度 | 背诵45,000位圆周率小数 | — |
| Luca Vadacca | 意大利 | 背诵22,801位圆周率小数 | — |
| Manuel Vergara Vial | 智利 | 背诵20,000位圆周率小数 | — |
What is documented — and what is not
✓ Documented
- 10,400 digits of pi recited on 13 February 2016 (Pi World Ranking List)
- Ranked 31st on that list
- Listed for India
? Unverified, disputed or wrong
- No age, date of birth, home town or school in the source
- No description of her preparation or of the verification procedure
- No record of any further attempt after February 2016
Questions people ask about Mamta Koona
How many digits of pi did Mamta Koona recite?
10,400, on 13 February 2016, according to the Pi World Ranking List.
What rank is Mamta Koona on the pi list?
Thirty-first. The leading entry is Suresh Kumar Sharma of India with 70,030 digits.
How old is Mamta Koona?
No source in this record gives her age or date of birth. The ranking list publishes only name, country, digits and date.
Is this a world record?
No. It is a ranked entry on the standing list. The highest total recorded on that list is 70,030 digits.
Is Mamta Koona on Wikipedia?
No Wikipedia article was found for her. The Pi World Ranking List entry is the primary published record.
How was the recitation verified?
The list page as read here does not set out its verification rules, so the procedure behind the figure is not documented in this record.
Where is Mamta Koona now?
No source in this record says. The published trail consists of the dated list entry and nothing after it.
Why do so many pi record holders come from India?
Four of the five highest entries on the list are Indian, including the top two, both set in 2015. The list documents the pattern but does not explain it.
Quick quiz: how well do you know Koona’s story?
How many digits of pi did Mamta Koona recite?
On what date?
Who leads the Pi World Ranking List?
Sources
- Pi World Ranking List — Pi — Pi World Ranking List
Checked by the Geniuses.club editorial team. Ages are given as of September 2026.
