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!)
A037209 Primes n such that nextprime(n) - n = ( number of divisors of (nextprime(n)+n)/2 )-1. 0
3, 61, 79, 317, 4730603, 9150613, 14791703, 27154511, 59259191, 203404631, 234273623, 237683879, 263802551, 314778551, 477772151, 500998679, 507736049, 628103831, 803042231, 1047040151, 1222341431, 1516790903, 1826793071, 2037439031, 2070067991, 2310340343 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..26.

PROG

(PARI) p1=3; for(m=2, 112664172, p2=nextprime(p1+1); if(p2-p1==numdiv((p2+p1)/2)-1, print1(p1 ", ")); p1=p2) /* Donovan Johnson, Sep 10 2012 */

CROSSREFS

Sequence in context: A297562 A128075 A106883 * A181505 A105430 A141979

Adjacent sequences:  A037206 A037207 A037208 * A037210 A037211 A037212

KEYWORD

nonn

AUTHOR

Naohiro Nomoto

EXTENSIONS

Next term if it exists is > 2*10^6. - Michel ten Voorde Apr 13 2001

Offset corrected and a(5)-a(26) from Donovan Johnson, Sep 10 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 December 15 11:43 EST 2019. Contains 329999 sequences. (Running on oeis4.)