login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216150 Smallest prime q such that sum(i=1..n-1, q mod(prime(i))) == q mod prime(n). 0
7, 2, 11, 71, 331, 13, 4217, 4643, 16381, 6007, 225217, 260339, 4772483, 117351431, 130554581, 2499413753 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

The sequence is infinite.

LINKS

Table of n, a(n) for n=2..17.

EXAMPLE

n = 2: p_n = 3, q = 7,7 (mod 2) = 1 and  1 = 7 (mod 3);

n = 3: p_n = 5, q = 2, 2 (mod(2,3)) = (0,2) and  0 + 2 = 2 = 2 (mod 5);

n = 4: p_n = 7, q = 11, 11 (mod(2,3,5)) = (1,2,1) and  1 + 2 + 1 = 4 = 11 (mod 7);

n = 5: p_n = 11, q = 71, 71 (mod(2,3,5,7)) = (1,2,1,1) and  1 + 2 + 1 + 1 = 5 = 71 (mod 11).

PROG

(PARI) for(n=2, 50, p=prime(n); q=2; while(sum(i=1, n-1, q%prime(i))<>q%p, q=nextprime(q+1)); print(n", "q))

CROSSREFS

Sequence in context: A248283 A147677 A090243 * A145338 A104586 A323995

Adjacent sequences:  A216147 A216148 A216149 * A216151 A216152 A216153

KEYWORD

nonn,more,hard

AUTHOR

Zak Seidov, Sep 02 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 00:10 EDT 2019. Contains 321305 sequences. (Running on oeis4.)