a(n) is the least prime of the form (3^r*5^s*7^t - 1)/2, r, s, t > 0, r + s + t = n.
A337427
a(n) is the least prime of the form (3^r*5^s*7^t - 1)/2, r, s, t > 0, r + s + t = n.
Terms
- a(0) =157a(1) =787a(2) =3307a(3) =19687a(4) =12757a(5) =347287a(6) =267907a(7) =3125587a(8) =2870437a(9) =5166787a(10) =25833937a(11) =590736037a(12) =232505437a(13) =2712563437a(14) =13562817187a(15) =3766588087a(16) =52313723437a(17) =726579492187a(18) =332213069317a(19) =847482319687
External references
- oeis: A337427