This site is supported by donations to The OEIS Foundation.

 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!)
 A098029 Primes of the form (prime(n)+ prime(n+3))/2. 2
 7, 23, 37, 47, 67, 73, 233, 277, 353, 479, 613, 631, 647, 809, 1097, 1283, 1297, 1433, 1453, 1471, 1493, 1607, 1613, 1663, 1709, 1721, 1783, 1867, 1889, 1901, 1931, 1993, 2099, 2137, 2161, 2377, 2383, 2411, 2521, 2621, 2683, 2693, 2713, 2797, 2879, 3049 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The union of {7}, A119381 and A117876. - Irina Gerasimova, Jul 11 2013 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE prime(2)=3, prime(2+3)=11. (3+11)/2 = 7 MATHEMATICA Select[(#[[1]]+#[[4]])/2&/@Partition[Prime[Range[500]], 4, 1], PrimeQ] (* Harvey P. Dale, Nov 30 2017 *) PROG (PARI) f(n, m) = for(x=1, n, y=prime(x)+prime(x+m); if(y%2==0 & isprime(y\2), print1(y\2", "))) CROSSREFS Sequence in context: A329931 A157811 A227421 * A098039 A132237 A227064 Adjacent sequences:  A098026 A098027 A098028 * A098030 A098031 A098032 KEYWORD easy,nonn AUTHOR Cino Hilliard, Sep 10 2004. 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.

Last modified December 14 16:38 EST 2019. Contains 329979 sequences. (Running on oeis4.)