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!)
 A048628 n-th 4k+1 prime times (n+1)st 4k+3 prime. 1
 35, 143, 323, 667, 1147, 1763, 2491, 3599, 4891, 6319, 7663, 8383, 11227, 12091, 17399, 19519, 21823, 26123, 29503, 32231, 35263, 43739, 46367, 50851, 57311, 61063, 66203, 70531, 77059, 84823, 89711, 103459 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MATHEMATICA Module[{nn=100, p1, p3, len}, p1=Select[Prime[Range[nn]], Mod[#, 4]==1&]; p3= Rest[Select[Prime[Range[nn]], Mod[#, 4]==3&]]; len=Min[Length[p1], Length[ p3]]; Times@@@Thread[{Take[p1, len], Take[p3, len]}]] (* Harvey P. Dale, Jan 09 2015 *) CROSSREFS Cf. A002144 A002145 A022757. Sequence in context: A327901 A290560 A136017 * A048629 A133534 A005339 Adjacent sequences:  A048625 A048626 A048627 * A048629 A048630 A048631 KEYWORD nonn AUTHOR Den Roussel (DenRoussel(AT)webtv.net) 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 8 18:37 EST 2019. Contains 329865 sequences. (Running on oeis4.)