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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A138397 Penta-Primes. Prime Numbers n as a Sum of 5 consecutive prime numbers (four twin primes and single prime number in between) are primes. 1
 181, 331, 1381, 6481, 6551, 8069, 10499, 11633, 17669, 17851, 27551, 44249, 45137, 50273, 51437, 68501, 73061, 85999, 90073, 90631, 112997, 115249, 142799, 154303, 186757, 196169, 237019, 238397, 247693, 250027, 266239, 278227, 291899, 337097, 344263, 354677 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE {29, 31} {37} {41, 43} Sum = 181 MATHEMATICA a={}; Do[p0=Prime[n]; a1=Prime[n-2]; a2=Prime[n-1]; b1=Prime[n+1]; b2=Prime[n+2]; sp=a1+a2+p0+b1+b2; If[PrimeQ[sp]&&a2-a1==2&&b2-b1==2, AppendTo[a, sp]], {n, 3, 10^3}]; a Select[Total/@Select[Partition[Prime[Range[1000]], 5, 1], #[[2]]-#[[1]]== #[[5]] -#[[4]]==2&], PrimeQ] (* Harvey P. Dale, Aug 26 2019 *) CROSSREFS Sequence in context: A168473 A142920 A142058 * A179484 A142258 A323192 Adjacent sequences:  A138394 A138395 A138396 * A138398 A138399 A138400 KEYWORD nonn,uned AUTHOR Vladimir Joseph Stephan Orlovsky, May 08 2008 EXTENSIONS More terms from Harvey P. Dale, Aug 26 2019 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 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)