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
Keywords
Examples
3.5.7, 7.13.19, 37.73.109, 211.421.631, 271.541.811 = A174734.A137702.A180025
Programs
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Mathematica
Select[Prime[Range[1000]], PrimeQ[2*#-1] && PrimeQ[3*#-2]&]*3-2