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A181098 Primefree centuries (i.e., no prime exists between 100*n and 100*n+99). 26
16718, 26378, 31173, 39336, 46406, 46524, 51782, 55187, 58374, 58452, 60129, 60850, 63338, 63762, 67898, 69587, 71299, 75652, 78035, 78269, 80277, 83674, 84213, 89052, 95490, 97080, 100881, 101527, 103438, 105916, 111772, 112967 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The first consecutive terms are 473267, 473268; see A190639. - M. F. Hasler, May 15 2011

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = n + 100n/log n - O(n/log^2 n). - Charles R Greathouse IV, Sep 08 2017

EXAMPLE

16718 is a member because there is no prime between 1671800 and 1671899.

PROG

(PARI) is(n)=nextprime(100*n)>100*n+99 \\ Charles R Greathouse IV, Apr 28 2015

CROSSREFS

Cf. A038822 (number of primes between 100n and 100n+99).

Cf. A186393-A186408 (centuries having 1 to 16 primes).

Sequence in context: A260312 A224572 A186311 * A202896 A183727 A128383

Adjacent sequences:  A181095 A181096 A181097 * A181099 A181100 A181101

KEYWORD

nonn

AUTHOR

Jeff Burch, Oct 02 2010

STATUS

approved

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Last modified May 26 07:44 EDT 2019. Contains 323579 sequences. (Running on oeis4.)