login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A060232 Smaller of twin primes whose middle term is a multiple of A002110(6)=30030. 3
180179, 270269, 300299, 330329, 390389, 420419, 540539, 660659, 840839, 1231229, 1261259, 1501499, 1621619, 1861859, 1921919, 1951949, 2012009, 2372369, 2762759, 2972969, 3663659, 3693689, 3723719, 3903899, 4084079 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000 (first 642 terms from Muniru A Asiru)

EXAMPLE

For the pair {5735729,5735731} (5735729+5735731)/2 = 191*30030.

MAPLE

for n from 1 to 10^5 do if (ithprime(n+1) - ithprime(n)) = 2 and (ithprime(n+1) + ithprime(n)) mod 30030 = 0 then print(ithprime(n)); fi; od; # Muniru A Asiru, Jan 29 2018

# More efficient:

select(t -> isprime(t) and isprime(t+2), [seq(30030*k-1, k=1..10^3)]); # Robert Israel, Jan 29 2018

PROG

(GAP) P:=Filtered([1..10^5], IsPrime);;

P1:=List(Filtered(Filtered(List([1..Length(P)-1], n -> [P[n], P[n+1]]), i -> i[2]-i[1]=2), j -> (j[1] + j[2]) mod 30030 = 0), k -> k[1]); # Muniru A Asiru, Jan 29 2018

CROSSREFS

A001359, A002110, A060229, A060230, A060231.

Sequence in context: A186062 A258562 A204787 * A190380 A235716 A274365

Adjacent sequences:  A060229 A060230 A060231 * A060233 A060234 A060235

KEYWORD

nonn

AUTHOR

Labos Elemer, Mar 21 2001

EXTENSIONS

Minor edits by Ray Chandler, Apr 04 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 25 05:14 EDT 2021. Contains 347652 sequences. (Running on oeis4.)