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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
OFFSET
1,1
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
KEYWORD
nonn
AUTHOR
STATUS
approved