A099662
a(n) is the least prime following A002282(n) repdigits.
Original entry on oeis.org
2, 11, 89, 907, 8893, 88897, 888917, 8888927, 88888901, 888888901, 8888888891, 88888888901, 888888888919, 8888888888921, 88888888888889, 888888888888907, 8888888888888927, 88888888888888889, 888888888888888947
Offset: 0
n=8: 88 is followed by 89.
A099664
a(n) is the largest prime before A002278(n).
Original entry on oeis.org
3, 43, 443, 4441, 44417, 444443, 4444409, 44444399, 444444443, 4444444429, 44444444441, 444444444443, 4444444444439, 44444444444353, 444444444444421, 4444444444444423, 44444444444444411, 444444444444444419
Offset: 1
A099657
a(n) is the least prime following A002277(n) repdigits.
Original entry on oeis.org
2, 5, 37, 337, 3343, 33343, 333337, 3333373, 33333347, 333333349, 3333333403, 33333333343, 333333333367, 3333333333347, 33333333333437, 333333333333389, 3333333333333343, 33333333333333391, 333333333333333391
Offset: 0
n=3: 33 is followed by 37.
A099661
a(n) is the least prime following A002281(n) repdigits.
Original entry on oeis.org
2, 11, 79, 787, 7789, 77783, 777781, 7777801, 77777803, 777777799, 7777777781, 77777777827, 777777777841, 7777777777859, 77777777777837, 777777777777787, 7777777777777867, 77777777777777797, 777777777777777817
Offset: 0
n=6: 77 is followed by 79.
-
Table[NextPrime[7*(10^n-1)/9], {n, 0, 35}]
NextPrime/@LinearRecurrence[{11,-10},{0,7},35] (* Harvey P. Dale, Dec 12 2021 *)
A099663
a(n) is the largest prime before A002276(n).
Original entry on oeis.org
19, 211, 2221, 22193, 222199, 2222219, 22222199, 222222193, 2222222137, 22222222189, 222222222169, 2222222222197, 22222222222201, 222222222222151, 2222222222222203, 22222222222222153, 222222222222222221, 2222222222222222177, 22222222222222222169, 222222222222222222149, 2222222222222222222161
Offset: 2
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Table[NextPrime[2(10^n-1)/9, -1], {n, 2, 35}]
Drop[NextPrime[#,-1]&/@LinearRecurrence[{11,-10},{0,2},20],2] (* Harvey P. Dale, Dec 19 2020 *)
A099665
a(n) is the largest prime before A002279(n).
Original entry on oeis.org
3, 53, 547, 5531, 55547, 555523, 5555527, 55555553, 555555541, 5555555519, 55555555543, 555555555551, 5555555555551, 55555555555541, 555555555555529, 5555555555555539, 55555555555555519, 555555555555555487, 5555555555555555533, 55555555555555555483, 555555555555555555491
Offset: 1
-
Table[NextPrime[5*(10^n-1)/9, -1], {n, 1, 35}]
NextPrime[#,-1]&/@Table[FromDigits[PadRight[{},n,5]],{n,20}] (* Harvey P. Dale, Aug 31 2015 *)
A099666
a[n] is the largest prime before A002280[n] repdigits.
Original entry on oeis.org
5, 61, 661, 6661, 66653, 666649, 6666617, 66666653, 666666653, 6666666661, 66666666643, 666666666619, 6666666666629, 66666666666647, 666666666666647, 6666666666666571, 66666666666666601, 666666666666666661
Offset: 1