A091762 Last n digits of concatenation of first n primes.

2, 23, 235, 2357, 35711, 571113, 7111317, 11131719, 113171923, 1317192329, 31719232931, 171923293137, 7192329313741, 19232931374143, 923293137414347, 2329313741434753, 32931374143475359, 293137414347535961, 9313741434753596167, 31374143475359616771, 137414347535961677173, 3741434753596167717379

Offset

1,1

Comments

a(n) = A019518(n) mod 10^n; a(n) mod 10^A055642(A000040(n)) = A000040(n); for the primes in this sequence see A091763.

Links

David A. Corneth, Table of n, a(n) for n = 1..1000

Eric Weisstein's World of Mathematics, Consecutive Number Sequences

Example

The first 5 primes are 2, 3, 5, 7, 11. The last 5 digits concatenated are 35711 so a(5) = 35711. - David A. Corneth, Sep 15 2019

Mathematica

Table[FromDigits[Take[Flatten[IntegerDigits/@Prime[Range[n]]], -n]], {n, 20}] (* Harvey P. Dale, Sep 15 2019 *)

Prog

(PARI) a(n) = {my(p = prime(n), v = digits(p)); while(#v < n, p = precprime(p - 1); v = concat(digits(p), v)); fromdigits(vector(n, i, v[#v - n + i]))} \\ David A. Corneth, Sep 15 2019

Crossrefs

Sequence in context: A118385 A098739 A287353 * A309706 A240959 A054261

Adjacent sequences: A091759 A091760 A091761 * A091763 A091764 A091765

Keyword

nonn,base,easy

Author

Reinhard Zumkeller, Feb 04 2004

Extensions

More terms from David A. Corneth, Sep 15 2019

Status

approved