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COMMENTS
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The row r=4 in the table of "Numbers n such that 2*r*3^n+1 is prime":
.1,..2,..4,..5,..6,..9,.16,.17,.30,.54,.57,.60,.65,.132,.180,
.1,..2,..3,..6,.14,.15,.39,201,249,
.1,..3,..4,..5,..8,.15,.16,.29,.53,.56,.59,.64,131,179,
.2,..7,..8,.10,.22,.52,.58,.76,130,143,
.1,..3,..4,..7,..9,.12,.18,.22,102,112,157,162,289,
.1,..2,..5,.13,.14,.38,200,248,
.1,..2,..3,.18,.22,.26,.27,.33,.39,.57,.62,.94,145,246,
.3,..4,..5,.12,.24,.36,.77,195,296,297,
.2,..3,..4,..7,.14,.15,.28,.52,.55,.58,.63,130,178,
.1,..2,..3,..4,..5,..8,.16,.19,.28,.50,134,280,
.1,..2,..4,..5,.10,.12,.14,.24,.34,.37,.52,.56,.65,.68,.96,106,128,156,169,236,254,
.1,..6,..7,..9,.21,.51,.57,.75,129,142,
.1,.12,.15,.17,.20,.29,.31,.32,.35,.37,.77,.95,193,203,224,296,
.3,..4,..8,.11,.14,.15,.18, (End)
2*A056799(16) = 2*161930 = 323860 is also a member, but I do not know if it is the next member. - Jeppe Stig Nielsen, Oct 13 2019
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