A205711 - OEIS

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A205711

Positions of multiples of 9 in A204890 (differences of primes).

7, 31, 37, 41, 51, 63, 69, 75, 82, 92, 96, 101, 112, 123, 129, 133, 140, 150, 159, 164, 178, 187, 198, 202, 214, 224, 228, 232, 236, 241, 246, 260, 269, 273, 280, 290, 294, 298, 301, 305, 310, 315, 323, 331, 336, 344, 358, 367, 371, 375, 386, 390

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

For a guide to related sequences, see A205558.

LINKS

Table of n, a(n) for n=1..52.

EXAMPLE

In A204890=(1,3,2,5,4,2,9,8,6,4,11,10,8,...), multiples of 9 are in positions 7,31,37,... See the example at A205712.

MATHEMATICA

(See the program at A205712.)

With[{prs=Prime[Range[30]]}, Flatten[Position[Flatten[Table[prs[[n]]- Take[ prs, n-1], {n, 2, Length[prs]}]], _?(Divisible[#, 9]&)]]] (* Harvey P. Dale, Dec 01 2013 *)

CROSSREFS

Cf. A204890, A205712, A205558.

Sequence in context: A184121 A167768 A103630 * A040064 A241101 A238664

Adjacent sequences: A205708 A205709 A205710 * A205712 A205713 A205714

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 31 2012

STATUS

approved