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A089943 Number of digits in candidates Sierpiński numbers of the first kind. 0
1, 3, 20, 617, 315653, 41373247568, 355393490465494856466, 13111705528158638560001549984013213785610, 8923364382984350190045623219438187007104891998452120469899352728663188707599765 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..8.

Eric Weisstein's World of Mathematics, Sierpiński Number of the First Kind

FORMULA

a(n) = ceiling(2^(n+2^n)*log_10(2)).

MATHEMATICA

a[k_] := Ceiling[2^(k+2^k) Log[2]/Log[10]];

CROSSREFS

Sequence in context: A203228 A174972 A300917 * A108699 A162134 A296408

Adjacent sequences:  A089940 A089941 A089942 * A089944 A089945 A089946

KEYWORD

nonn,base

AUTHOR

Eric W. Weisstein, Nov 16 2003

STATUS

approved

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Last modified October 23 07:11 EDT 2019. Contains 328336 sequences. (Running on oeis4.)