XPM Prime Explorer symbol
XPMPrime Explorer

Block #337,183

TWNLength 10β˜…β˜…β˜†β˜†β˜†

Bi-Twin Chain Β· Discovered 12/31/2013, 12:00:37 PM Β· Difficulty 10.1384 Β· 6,489,539 confirmations

TWN
Bi-Twin Chain

Interleaved pairs of primes that differ by 2, forming twin prime pairs at each level.

Block Header
Block Hash
471478e112d65b3583d94b03f39d04076670c181a7dad31b42f6fedfc187f4e1
View on Chainz β†—

Height

#337,183

Difficulty

10.138440

Transactions

1

Size

207 B

Version

2

Bits

0a2370ce

Nonce

10,656

Timestamp

12/31/2013, 12:00:37 PM

Confirmations

6,489,539

Mined by

⛏️ P2SHAbwWkWZtvvKWFxiUbZcGD749fwkawDhufa

Merkle Root

f4af9bc697324150b5ec7c0d77660b1a65eb141b190ac239219383dd2322b867
Transactions (1)
Coinbasef4af9bc6973241…9383dd2322b867
1 in β†’ 1 out9.7100 XPM116 B
AbwWkWZt…kawDhufa
Prime Chain Origin

This is the prime chain origin stored in the block header. It is a composite number (not prime itself) β€” it equals the first prime in the chain multiplied by a primorial. The origin anchors the entire chain to this specific block.

1.214 Γ— 10⁹⁸(99-digit number)
12143246293733668091…64149755261905037599
Discovered Prime Numbers
Lower: 2^k Γ— origin βˆ’ 1 | Upper: 2^k Γ— origin + 1

These are the actual prime numbers discovered by this block, computed using the verified Primecoin formula. Each number has been independently confirmed to pass the Fermat primality test. Use the FactorDB links to verify any number independently.

Level 0 β€” Twin Prime Pair (origin Β± 1)
origin βˆ’ 1
1.214 Γ— 10⁹⁸(99-digit number)
12143246293733668091…64149755261905037599
Verify on FactorDB β†—Wolfram Alpha β†—
origin + 1
1.214 Γ— 10⁹⁸(99-digit number)
12143246293733668091…64149755261905037601
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: origin + 1 βˆ’ origin βˆ’ 1 = 2 (twin primes βœ“)
Level 1 β€” Twin Prime Pair (2^1 Γ— origin Β± 1)
2^1 Γ— origin βˆ’ 1
2.428 Γ— 10⁹⁸(99-digit number)
24286492587467336183…28299510523810075199
Verify on FactorDB β†—Wolfram Alpha β†—
2^1 Γ— origin + 1
2.428 Γ— 10⁹⁸(99-digit number)
24286492587467336183…28299510523810075201
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^1 Γ— origin + 1 βˆ’ 2^1 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)
Level 2 β€” Twin Prime Pair (2^2 Γ— origin Β± 1)
2^2 Γ— origin βˆ’ 1
4.857 Γ— 10⁹⁸(99-digit number)
48572985174934672367…56599021047620150399
Verify on FactorDB β†—Wolfram Alpha β†—
2^2 Γ— origin + 1
4.857 Γ— 10⁹⁸(99-digit number)
48572985174934672367…56599021047620150401
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^2 Γ— origin + 1 βˆ’ 2^2 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)
Level 3 β€” Twin Prime Pair (2^3 Γ— origin Β± 1)
2^3 Γ— origin βˆ’ 1
9.714 Γ— 10⁹⁸(99-digit number)
97145970349869344735…13198042095240300799
Verify on FactorDB β†—Wolfram Alpha β†—
2^3 Γ— origin + 1
9.714 Γ— 10⁹⁸(99-digit number)
97145970349869344735…13198042095240300801
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^3 Γ— origin + 1 βˆ’ 2^3 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)
Level 4 β€” Twin Prime Pair (2^4 Γ— origin Β± 1)
2^4 Γ— origin βˆ’ 1
1.942 Γ— 10⁹⁹(100-digit number)
19429194069973868947…26396084190480601599
Verify on FactorDB β†—Wolfram Alpha β†—
2^4 Γ— origin + 1
1.942 Γ— 10⁹⁹(100-digit number)
19429194069973868947…26396084190480601601
Verify on FactorDB β†—Wolfram Alpha β†—
Difference: 2^4 Γ— origin + 1 βˆ’ 2^4 Γ— origin βˆ’ 1 = 2 (twin primes βœ“)

What this block proved

The miner who found this block proved the existence of 10 consecutive prime numbers forming a Bi-Twin Chain. The prime chain origin β€” the large number shown above β€” anchors the chain and is divisible by a primorial (the product of small primes), cryptographically tying these prime numbers to this specific block.

β˜…β˜…β˜†β˜†β˜†
Rarity
UncommonChain length 10

Roughly 1 in 100 blocks. Solid but expected in a healthy network.

How Primecoin's Proof-of-Work Constructs These Primes

Primecoin stores a value called the prime chain origin in each block. The miner found a large integer such that when divided by a primorial (the product of small primes: 2 Γ— 3 Γ— 5 Γ— 7 Γ— …), the result is the first prime in the chain. The origin is deliberately divisible by this primorial β€” that divisibility is part of the proof.

Prime Chain Origin = First Prime Γ— Primorial (2Β·3Β·5Β·7Β·11·…)
Source: Primecoin prime.cpp β€” CheckPrimeProofOfWork()

This is why the origin has many small prime factors β€” those factors are the primorial divisor. The chain then extends from the first prime using the TWN formula:

TWN: twin pairs (p, p+2) where p = origin/primorial βˆ’ 1 and p+2 = origin/primorial + 1
Cross-reference on Chainz Explorer
Circulating Supply:57,857,930 XPMΒ·at block #6,826,721 Β· updates every 60s
xpmprime.info is a work in progress. If you enjoy using this service you can support this project with a Primecoin donation.
Privacy PolicyΒ·
AQZeJoQ81VgeHQBpEYTgvNqV1gnz3L5SvK

Cookie Preferences

We use cookies to enhance your experience. Some are essential for the site to function, while others help us understand how you use the site.

Β·Privacy Policy