A139053 -id:A139053 - cp's OEIS frontend

A139054 Array read by rows: row n lists the first 4 primes with n digits.

2, 3, 5, 7, 11, 13, 17, 19, 101, 103, 107, 109, 1009, 1013, 1019, 1021, 10007, 10009, 10037, 10039, 100003, 100019, 100043, 100049, 1000003, 1000033, 1000037, 1000039, 10000019, 10000079, 10000103, 10000121, 100000007, 100000037, 100000039, 100000049

Offset: 1

Omar E. Pol, Apr 08 2008

First differs from A000040 at a(9). - Omar E. Pol, Feb 13 2014

			Array begins:
    2,   3,   5,   7;
   11,  13,  17,  19;
  101, 103, 107, 109;
  ...

Cf. A000040, A003617, A073914, A139052, A139053.

Flatten @ Table[ NextPrime[10^i, Range @ 4], {i, 0, 9}] (* Mikk Heidemaa, Jan 08 2023 *)

a(4n-3) = A003617(n). - Omar E. Pol, Feb 13 2014

More terms from Michel Marcus, Feb 13 2014

A139052 Array read by rows: row n lists the first two primes with n digits.

Original entry on oeis.org

2, 3, 11, 13, 101, 103, 1009, 1013, 10007, 10009, 100003, 100019, 1000003, 1000033, 10000019, 10000079, 100000007, 100000037, 1000000007, 1000000009, 10000000019, 10000000033, 100000000003, 100000000019, 1000000000039, 1000000000061

Offset: 1

Omar E. Pol, Apr 08 2008

Cf. A000040, A003617, A073914, A139053, A139054.

ftp[d_]:=Module[{np1=NextPrime[10^(d-1)]},{np1,NextPrime[np1]}]; Array[ ftp,15]//Flatten (* Harvey P. Dale, Mar 27 2021 *)

More terms from Sean A. Irvine, Jun 02 2011

cp's OEIS Frontend

A139054 Array read by rows: row n lists the first 4 primes with n digits.

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