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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A082931 a(1) = 1; a(n) = least k > a(n-1) such that a(i)+k is prime for some i < n and each prime of form a(i)+a(j) occurs for unique i <= j. 3
 1, 2, 3, 5, 8, 14, 20, 23, 24, 37, 43, 48, 49, 55, 61, 75, 90, 109, 117, 118, 121, 139, 141, 157, 183, 193, 199, 212, 223, 229, 241, 245, 271, 277, 296, 301, 313, 320, 321, 331, 363, 368, 393, 403, 410, 422, 439, 457, 468, 469, 481, 491, 511, 525, 530, 535, 607 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA a[1]=1; p[1]={2}; a[n_] := Module[{k, new}, For[k=a[n-1]+1, Intersection[p[n-1], (new=Select[(a/@Range[n-1])+k, PrimeQ])]!={}||new=={}, k++, Null]; p[n]=Union[p[n-1], new]; a[n]=k] CROSSREFS Cf. A082932, A082933, A080435. Sequence in context: A117566 A123000 A132599 * A034413 A034416 A306912 Adjacent sequences:  A082928 A082929 A082930 * A082932 A082933 A082934 KEYWORD nonn AUTHOR David W. Wilson, Apr 14 2003 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 August 14 04:13 EDT 2020. Contains 336477 sequences. (Running on oeis4.)