14159...64821 (281-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

                                                                           1
4159265358 9793238462 6433832795 0288419716 9399375105 8209749445 9230781640
6286208998 6280348253 4211706798 2148086513 2823066470 9384460955 0582231725
3594081284 8111745028 4102701938 5211055596 4462294895 4930381964 4288109756
6593344612 8475648233 7867831652 7120190914 5648566923 4603486104 5432664821

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The smallest googol prime formed from first n digits after decimal point in π (case n=281). [Gupta]