A180025 Prime numbers 3*n-2 such that n, 2*n-1 and 3*n-2 are prime.

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

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