A091016 - OEIS

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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

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OFFSET

1,1

COMMENTS

a(19) > 1.e14 if it exists. - Hugo van der Sanden, Aug 06 2021

LINKS

Table of n, a(n) for n=1..18.

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

Adjacent sequences: A091013 A091014 A091015 * A091017 A091018 A091019

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