81st chen prime is 641

81st chen prime is 641.

641 is 81st chen prime.

Learn more about Chen primes.

Neighbours#

509₁₀	521₇	541₁₀	557₁₀	563₁₃
569₉	571₈	577₁₂	587₉	599₁₁
617₁₀	631₇	641₁₅	647₁₆	653₁₄
659₉	677₇	683₁₁	701₇	719₉
743₉	751₈	761₁₀	769₁₄	787₇

Compare with#

509₁₀	521₇	541₁₀	557₁₀	563₁₃
569₉	571₈	577₁₂	587₉	599₁₁
617₁₀	631₇	641₁₅	647₁₆	653₁₄
659₉	677₇	683₁₁	701₇	719₉
743₉	751₈	761₁₀	769₁₄	787₇

Learn more about Chen primes
Check first 100 chen primes
Check chen primes up to 1000
Check all chen primes

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