A382697 Decimal expansion of 195^(1/7).

2, 1, 2, 3, 9, 6, 7, 1, 7, 9, 8, 7, 3, 5, 9, 0, 3, 1, 4, 7, 9, 4, 8, 2, 3, 8, 3, 6, 1, 6, 9, 7, 7, 0, 7, 3, 5, 8, 6, 6, 1, 8, 5, 6, 3, 4, 7, 8, 7, 1, 6, 4, 1, 9, 9, 5, 3, 3, 8, 3, 8, 9, 0, 3, 9, 8, 8, 6, 9, 9, 1, 0, 1, 6, 5, 9, 0, 4, 7, 9, 6, 7, 0, 9, 1, 7, 2, 2, 6, 6, 9, 4, 2, 4, 5, 5, 4, 4, 2, 3

Offset

1,1

Comments

In 1999 Cook showed that an odd perfect number with k distinct prime factors has c^c^k as an upper bound, where c denotes this constant.

References

R. J. Cook, Bounds for odd perfect numbers. In Number Theory (edited by R. Gupta). CRM Proc. Lecture Notes #19, 67-71. Amer. Math. Soc., Providence, RI, 1999.

Paulo Ribenboim, The Little Book of Bigger Primes, Springer-Verlag NY 2004. See p. 84.

Links

Table of n, a(n) for n=1..100.

Index entries for sequences related to the decimal expansion of roots.

Example

2.1239671798735903147948238361697707358661856...

Mathematica

RealDigits[195^(1/7), 10, 100][[1]]

Crossrefs

Sequence in context: A120405 A252889 A155004 * A176954 A034952 A378754

Adjacent sequences: A382694 A382695 A382696 * A382698 A382699 A382700

Keyword

nonn,cons,easy

Author

Stefano Spezia, Apr 03 2025

Status

approved