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A210477 Product of adjacent primes with a gap of 6. 2
667, 1147, 2491, 3127, 4087, 5767, 7387, 17947, 23707, 25591, 28891, 30967, 55687, 64507, 67591, 70747, 75067, 111547, 126727, 136891, 141367, 148987, 190087, 198907, 256027, 295927, 313591, 320347, 329467, 348091, 355207, 364807, 372091, 422491, 430327, 462391, 532891 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A111192.

Sum_{n>=1} 1/a(n) > 0.00405067912.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = A031924(n)*(A031924(n)+6).

MAPLE

A210477 := proc(n)

    A031924(n)*(A031924(n)+6) ;

end proc:

seq(A210477(n), n=1..100) ; # R. J. Mathar, Jan 23 2013

MATHEMATICA

Times@@@Select[Partition[Prime[Range[200]], 2, 1], #[[2]]-#[[1]]==6&] (* Harvey P. Dale, Aug 22 2019 *)

CROSSREFS

Sequence in context: A046694 A326255 A326256 * A138563 A327908 A092797

Adjacent sequences:  A210474 A210475 A210476 * A210478 A210479 A210480

KEYWORD

nonn

AUTHOR

R. J. Mathar, Jan 23 2013

STATUS

approved

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Last modified May 27 21:52 EDT 2020. Contains 334671 sequences. (Running on oeis4.)