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A031887
Lucky numbers with size of gaps equal to 4 (upper terms).
1
7, 13, 25, 37, 67, 73, 79, 115, 133, 163, 193, 205, 223, 235, 241, 289, 307, 331, 361, 433, 487, 541, 583, 619, 643, 655, 727, 739, 745, 781, 805, 823, 931, 937, 961, 979, 997, 1057, 1105, 1183, 1201, 1249, 1285, 1369, 1459, 1495, 1501, 1567
OFFSET
1,1
LINKS
CROSSREFS
Cf. A000959.
Sequence in context: A255653 A362632 A200270 * A294943 A363080 A111721
KEYWORD
nonn
STATUS
approved