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A091016
a(n) is the least x such that the n values x+0, x+6, x+12, ..., x+6*(n-1) are all products of exactly two primes (i.e., semiprimes).
2
4, 4, 9, 203, 1333, 1333, 1333, 2159, 8309, 18799, 60499, 60499, 186779, 186779, 186779, 12015573923, 12015573923, 6763513182767
OFFSET
1,1
COMMENTS
a(19) > 1.e14 if it exists. - Hugo van der Sanden, Aug 06 2021
EXAMPLE
a(4)=203 because 203 = 7*29, 209 = 11*19, 215 = 5*43, 221 = 13*17.
CROSSREFS
Cf. A082919, A092129. Row 6 of A124570.
Sequence in context: A173317 A059811 A202409 * A198025 A205549 A120395
KEYWORD
nonn,fini
AUTHOR
Don Reble, Feb 25 2004
EXTENSIONS
a(8) and a(9) corrected and a(18) from Donovan Johnson, Oct 01 2010
STATUS
approved