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

1,1

Comments

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

Links

Table of n, a(n) for n=1..36.

Formula

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

Example

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

Mathematica

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

Crossrefs

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

Sequence in context: A175063 A248199 A198196 * A290959 A003309 A063884

Adjacent sequences: A139051 A139052 A139053 * A139055 A139056 A139057

Keyword

base,nonn,tabf

Author

Omar E. Pol, Apr 08 2008

Extensions

More terms from Michel Marcus, Feb 13 2014

Status

approved