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A362507
Squarefree semiprimes (products of two distinct primes) between sphenic numbers (products of three distinct primes).
0
1546, 2066, 2234, 2554, 3334, 3566, 3814, 4586, 4894, 4946, 5422, 5594, 6098, 6602, 6694, 6746, 7286, 7346, 7706, 7846, 7886, 8042, 8114, 8438, 8986, 9094, 9806, 10154, 10294, 10786, 10834, 10886, 11038, 11138, 11246, 11846, 12094, 13406, 13714, 13894, 13982, 14002, 14054
OFFSET
1,1
EXAMPLE
1546 = 2*773 (between 1545 = 3*5*103 and 1547 = 7*13*17)
2066 = 2*1033 (between 2065 = 5*7*59 and 2067 = 3*13*53)
2234 = 2*1117 (between 2233 = 7*11*29 and 2235 = 3*5*149)
MATHEMATICA
SequencePosition[Table[FactorInteger[n][[;; , 2]], {n, 2, 15000}], {{1, 1, 1}, {1, 1}, {1, 1, 1}}][[;; , 2]] (* Amiram Eldar, Apr 23 2023 *)
CROSSREFS
Sequence in context: A232102 A234031 A038009 * A249008 A249473 A246899
KEYWORD
nonn
AUTHOR
Massimo Kofler, Apr 23 2023
STATUS
approved