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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A054750 Smallest prime number whose digits sum to n-th prime. 8
2, 3, 5, 7, 29, 67, 89, 199, 599, 2999, 4999, 29989, 59999, 79999, 389999, 989999, 6999899, 8989999, 59899999, 89999999, 289999999, 799999999, 3999998999, 19999997999, 79999999999, 399999998999, 599999899999, 999998999999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) >= A051885(A000040(n)). Indices n for which the equality holds are listed in A055019.

a(n) >= A046864(n). - Michel Marcus, Nov 01 2015

LINKS

Table of n, a(n) for n=1..28.

Chris Caldwell and G. L. Honaker, Jr., Prime curio for 8999

EXAMPLE

E.g. a(7)=89 because 8+9=17 and 17 is the 7th prime.

PROG

(PARI) a(n) = {my(k=2); my(p=prime(n)); while((sumdigits(k) != prime(n)), k=nextprime(k+1)); k; } \\ Michel Marcus, Nov 01 2015

CROSSREFS

Cf. A000040, A067180, A046704, A046704, A046864, A068951, A007605.

Sequence in context: A046864 A090712 A082257 * A048404 A052013 A269022

Adjacent sequences:  A054747 A054748 A054749 * A054751 A054752 A054753

KEYWORD

base,nonn

AUTHOR

G. L. Honaker, Jr., Apr 24 2000

EXTENSIONS

More terms from Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), May 31 2000

Edited and extended by Robert G. Wilson v, Feb 26 2002

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 December 15 09:05 EST 2019. Contains 329995 sequences. (Running on oeis4.)