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A180025 Prime numbers 3*n-2 such that n, 2*n-1 and 3*n-2 are prime. 1
7, 19, 109, 631, 811, 919, 991, 1009, 1801, 2179, 3511, 3709, 3889, 4591, 4969, 6661, 6841, 7669, 9109, 9181, 9199, 12781, 13339, 14401, 14851, 15679, 16741, 17551, 18451, 19081, 20071, 20521, 20899, 22861, 23041, 23059, 23599, 24049, 24499 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

EXAMPLE

3.5.7, 7.13.19, 37.73.109, 211.421.631, 271.541.811 = A174734.A137702.A180025

MATHEMATICA

Select[Prime[Range[1000]], PrimeQ[2*#-1] && PrimeQ[3*#-2]&]*3-2

CROSSREFS

Cf. A137702, A174734

Sequence in context: A240150 A091149 A180016 * A070976 A249608 A265281

Adjacent sequences:  A180022 A180023 A180024 * A180026 A180027 A180028

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jan 13 2011

STATUS

approved

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Last modified December 9 21:41 EST 2016. Contains 278987 sequences.