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A031903 Lucky numbers with size of gaps equal to 20 (upper terms). 2
957, 1797, 2943, 3003, 3027, 3153, 3747, 4227, 4695, 4761, 5211, 5547, 5637, 6621, 7629, 7737, 8253, 8535, 9915, 9957, 10173, 10311, 10341, 11157, 12357, 12519, 12699, 13677, 13893, 14775, 14817, 14997, 15291, 15333, 15417, 15567 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

t = Range[1, 20000, 2]; sieve[n_] := Module[{k = t[[n]]},  t = Delete[t, Table[{i}, {i, k, Length[t], k}]]]; n = 1; While[ t[[n]] < Length[t], n++; sieve[n]]; Transpose[Select[Partition[t, 2, 1], Last[#]- First[#]==20&]][[2]]  (* Harvey P. Dale, Apr 07 2011 *)

CROSSREFS

Cf. A000959, A031902.

Sequence in context: A187635 A076528 A260067 * A226851 A158410 A108903

Adjacent sequences:  A031900 A031901 A031902 * A031904 A031905 A031906

KEYWORD

nonn

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified July 5 01:22 EDT 2020. Contains 335457 sequences. (Running on oeis4.)