A124262
a(n) is the largest prime < 10*a(n-1) for n > 1, with a(1) = 2.
Original entry on oeis.org
2, 19, 181, 1801, 17989, 179849, 1798487, 17984833, 179848309, 1798483067, 17984830667, 179848306667, 1798483066669, 17984830666651, 179848306666507, 1798483066665031, 17984830666650269, 179848306666502647, 1798483066665026389, 17984830666650263887, 179848306666502638867
Offset: 1
Sequences for initial term k:
A124263 (k=3),
A124267 (5),
A124291 (7),
A124290 (11),
A124298 (13),
A124299 (17),
A124336 (23),
A124310 (29),
A124335 (31),
A124337 (37),
A124338 (41).
A124361
Largest prime < 1000*a(n-1), a(1)=2.
Original entry on oeis.org
2, 1999, 1998991, 1998990991, 1998990990979, 1998990990978973, 1998990990978972953, 1998990990978972952981, 1998990990978972952980973, 1998990990978972952980972937, 1998990990978972952980972936953, 1998990990978972952980972936952943, 1998990990978972952980972936952942969
Offset: 1
A124362
Largest prime < 100000*a(n-1), a(1)=2.
Original entry on oeis.org
2, 199999, 19999899919, 1999989991899967, 199998999189996699997, 19999899918999669999699797, 1999989991899966999969979699969, 199998999189996699996997969996899977, 19999899918999669999699796999689997699987, 1999989991899966999969979699968999769998699901
Offset: 1
A124364
Largest prime < 10000*a(n-1), a(1)=2.
Original entry on oeis.org
2, 19997, 199969967, 1999699669993, 19996996699929961, 199969966999299609907, 1999699669992996099069973, 19996996699929960990699729941, 199969966999299609906997299409939, 1999699669992996099069972994099389959, 19996996699929960990699729940993899589873
Offset: 1
-
NestList[NextPrime[10000#,-1]&,2,10] (* Harvey P. Dale, Nov 07 2020 *)
A124190
a(n) is the largest prime < 4*a(n-1) for n > 1, with a(1) = 2.
Original entry on oeis.org
2, 7, 23, 89, 353, 1409, 5623, 22483, 89923, 359663, 1438643, 5754571, 23018273, 92073083, 368292317, 1473169213, 5892676849, 23570707387, 94282829533, 377131318127, 1508525272477, 6034101089897, 24136404359569, 96545617438253, 386182469752993, 1544729879011951
Offset: 1
A126033
a(n) is the largest prime < 5*a(n-1) for n > 1, with a(1) = 2.
Original entry on oeis.org
2, 7, 31, 151, 751, 3739, 18691, 93427, 467123, 2335607, 11678021, 58390103, 291950479, 1459752391, 7298761949, 36493809683, 182469048409, 912345242041, 4561726210189, 22808631050929, 114043155254641, 570215776273147, 2851078881365711, 14255394406828543, 71276972034142687
Offset: 1
-
Nest[Append[#,NextPrime[5Last[#],-1]]&,{2},24] (* James C. McMahon, Dec 23 2024 *)
A126035
a(n) is the largest prime < 7*a(n-1) for n > 1, with a(1) = 2.
Original entry on oeis.org
2, 13, 89, 619, 4327, 30271, 211891, 1483231, 10382599, 72678187, 508747279, 3561230947, 24928616591, 174500315999, 1221502211987, 8550515483903, 59853608387317, 418975258711193, 2932826810978261, 20529787676847809, 143708513737934633, 1005959596165542401, 7041717173158796783
Offset: 1
A126036
a(n) is the largest prime < 8*a(n-1) for n > 1, with a(1) = 2.
Original entry on oeis.org
2, 13, 103, 823, 6581, 52639, 421103, 3368809, 26950453, 215603623, 1724828887, 13798631089, 110389048703, 883112389613, 7064899116901, 56519192935207, 452153543481457, 3617228347851583, 28937826782812601, 231502614262500793, 1852020914100006319, 14816167312800050537
Offset: 1
-
Nest[Append[#,NextPrime[8Last[#],-1]]&,{2}, 21] (* James C. McMahon, Dec 31 2024 *)
A126037
a(n) is the largest prime < 9*a(n-1) for n > 1, with a(1) = 2.
Original entry on oeis.org
2, 17, 151, 1327, 11941, 107467, 967201, 8704783, 78343019, 705087151, 6345784343, 57112059061, 514008531493, 4626076783423, 41634691050803, 374712219457181, 3372409975114627, 30351689776031621, 273165207984284509, 2458486871858560579, 22126381846727045189, 199137436620543406691
Offset: 1
A126039
a(n) is the largest prime < 11*a(n-1) for n > 1, with a(1) = 2.
Original entry on oeis.org
2, 19, 199, 2179, 23957, 263521, 2898683, 31885507, 350740567, 3858146203, 42439608221, 466835690359, 5135192593939, 56487118533317, 621358303866457, 6834941342530991, 75184354767840859, 827027902446249409, 9097306926908743457, 100070376195996178013, 1100774138155957958123
Offset: 1
Showing 1-10 of 15 results.