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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A073627 a(1)=a(2)=1; for n > 2, a(n) is the smallest integer such that a(n) > a(n-1) and a(n)+a(n-1) is prime. 9
1, 1, 2, 3, 4, 7, 10, 13, 16, 21, 22, 25, 28, 31, 36, 37, 42, 47, 50, 51, 52, 55, 58, 69, 70, 79, 84, 89, 90, 91, 100, 111, 112, 115, 118, 121, 130, 133, 136, 141, 142, 151, 156, 157, 160, 171, 176, 177, 182, 185, 188, 191, 192, 197, 200, 201, 208, 211, 220, 223 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Essentially the same as A062042. [John W. Layman, Oct 11 2013]

LINKS

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

MATHEMATICA

s=1; Join[{1, 1}, Table[k=s+1; While[ !PrimeQ[k+s], k++ ]; s=k, {100}]] (* T. D. Noe, Nov 02 2009 *)

PROG

(PARI) FirstTerms(n)={my(x=1, y, a=vector(n), j=2); a[1]=1; a[2]=1; while(j++<=n, y=x+1; while(!isprime(x+y), y++); x=y; a[j]=y); return(a)} \\ R. J. Cano, Jan 18 2017

CROSSREFS

Cf. A073628.

Sequence in context: A105330 A097545 A202016 * A062042 A107817 A008811

Adjacent sequences:  A073624 A073625 A073626 * A073628 A073629 A073630

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Aug 08 2002

EXTENSIONS

Edited by Matthew Conroy, Oct 21 2002

Definition corrected by T. D. Noe, Nov 02 2009

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 23 09:54 EST 2017. Contains 295116 sequences.