This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A227281 First primes of arithmetic progressions of 5 primes each with the common difference 30. 7
 7, 11, 37, 107, 137, 151, 277, 359, 389, 401, 541, 557, 571, 877, 1033, 1493, 1663, 2221, 2251, 2879, 3271, 6269, 6673, 6703, 7457, 7487, 9431, 10103, 10133, 10567, 11981, 12457, 12973, 14723, 17047, 19387, 24061, 25643, 25673, 26861, 26891, 27337, 27367 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The minimal possible difference in an AP-k is conjectured to be k# for all k > 7. For k = 5, we have d = 3# = 6 and there is ONLY one AP-5 with this difference: {5, 11, 17, 23, 29}. LINKS Sameen Ahmed Khan, Table of n, a(n) for n = 1..1184 EXAMPLE p = 11 then {11, 11 + 1*30, 11 + 2*30, 11 + 3*30, 11 + 4*30} = {11, 41, 71, 101, 131}, which is 5 primes in arithmetic progression with the difference 5# = 30. MATHEMATICA Clear[p]; d = 30; ap5p = {}; Do[If[PrimeQ[{p, p + d, p + 2*d, p + 3*d, p + 4*d}] == {True, True, True, True, True}, AppendTo[ap5p, p]], {p, 3, 25000, 2}]; ap5p CROSSREFS Cf. A001359, A023241, A023271, A094220, A156204, A227282, A227283, A227284, A227285, A227286. Sequence in context: A019416 A138122 A176955 * A268579 A129865 A153377 Adjacent sequences:  A227278 A227279 A227280 * A227282 A227283 A227284 KEYWORD nonn AUTHOR Sameen Ahmed Khan, Jul 05 2013 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.