A072673 - OEIS

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A072673

Primes of form prime(n)*prime(2*n)+prime(n)+prime(2*n).

11, 31, 83, 359, 1487, 4283, 4751, 5471, 7127, 12527, 41183, 66863, 71339, 85247, 186119, 274223, 290987, 338687, 373859, 386219, 400679, 465299, 490643, 663407, 720791, 827147, 883739, 1096127, 1124603

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

OFFSET

1,1

LINKS

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

EXAMPLE

A000040(236) = 1487 = 1403+23+61 = 23*61+23+61 = A000040(9)*A000040(18)+A000040(9)+A000040(18), therefore 1487 is a term.

MATHEMATICA

p[n_]:=Module[{p1=Prime[n], p2=Prime[2n]}, p1*p2+p1+p2]; Select[ Array[ p, 200], PrimeQ] (* Harvey P. Dale, Jul 14 2014 *)

CROSSREFS

Cf. A072672, A066938.

Sequence in context: A038768 A269789 A072672 * A250461 A259508 A126365

Adjacent sequences: A072670 A072671 A072672 * A072674 A072675 A072676

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jun 30 2002

STATUS

approved