21st happy prime is 397

21st happy prime is 397.

397 is 21st happy prime.

Learn more about Happy primes.

Neighbours#

109₂₁	139₇	167₁₂	193₁₉	239₁₁
263₁₅	293₉	313₁₆	331₁₁	367₁₀
379₁₁	383₁₅	397₉	409₁₀	487₁₁
563₁₃	617₁₀	653₁₄	673₁₀	683₁₁
709₉	739₁₄	761₁₀	863₁₃	881₁₃

Compare with#

109₂₁	139₇	167₁₂	193₁₉	239₁₁
263₁₅	293₉	313₁₆	331₁₁	367₁₀
379₁₁	383₁₅	397₉	409₁₀	487₁₁
563₁₃	617₁₀	653₁₄	673₁₀	683₁₁
709₉	739₁₄	761₁₀	863₁₃	881₁₃

Learn more about Happy primes
Check first 50 happy primes
Check happy primes up to 500
Check all happy primes

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