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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A174243 Least of 5 consecutive integers such that product of them is average of twin prime pairs. 2
7, 75, 178, 209, 371, 431, 497, 516, 679, 770, 802, 830, 858, 931, 957, 1221, 1232, 1251, 1309, 1397, 1419, 1545, 1567, 1683, 1713, 1714, 1834, 1901, 1991, 2337, 2408, 2441, 2505, 2623, 2651, 2673, 2726, 3142, 3223, 3269, 3349, 3386, 3387, 3461, 3492 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

7*8*9*10*11=55440 +-1 -> primes,..

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

f1[n_]:=PrimeQ[n-1]&&PrimeQ[n+1]; f2[n_]:=n*(n+1)*(n+2)*(n+3)*(n+4); lst={}; Do[If[f1[f2[n]], AppendTo[lst, n]], {n, 8!}]; lst

CROSSREFS

Cf. A014574, A174242

Sequence in context: A323322 A326221 A197091 * A157706 A197763 A202251

Adjacent sequences:  A174240 A174241 A174242 * A174244 A174245 A174246

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Mar 13 2010

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 July 18 19:00 EDT 2019. Contains 325144 sequences. (Running on oeis4.)