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A103871 Numbers n such that 100n + 69 is prime. 1
2, 5, 7, 10, 16, 20, 22, 29, 31, 34, 37, 49, 55, 56, 58, 62, 64, 65, 68, 70, 73, 76, 80, 82, 83, 86, 89, 97, 100, 101, 103, 110, 113, 119, 122, 125, 134, 136, 143, 146, 148, 149, 152, 155, 160, 163, 175, 176, 181, 182, 188, 190, 194, 202, 203, 211, 212, 215, 223 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) ~ 0.4n log n.

EXAMPLE

n=2: 269 is prime.

n=49: 4969 is prime.

n=97: 9769 is prime.

MAPLE

filter:= proc(n) isprime(100*n+69) end proc:

select(filter, [$1..300]); # Robert Israel, Sep 30 2018

PROG

(MAGMA) [ n: n in [1..300] | IsPrime(Seqint([9, 6] cat Intseq(n))) ];

(PARI) is(n)=isprime(100*n+69) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A102339 A172410 A266594 * A068817 A156779 A345127

Adjacent sequences:  A103868 A103869 A103870 * A103872 A103873 A103874

KEYWORD

nonn,easy

AUTHOR

Parthasarathy Nambi, Mar 30 2005

STATUS

approved

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Last modified June 23 11:29 EDT 2021. Contains 345397 sequences. (Running on oeis4.)