cp's OEIS Frontend

A066549 Let N = 235711171923293137..., the concatenation of the primes. a(n) is the n-digit number formed from the digits of N starting from the {n(n-1)/2 +1}th digit. Omit any leading zeros.

%I A066549 #9 Oct 27 2023 19:05:45
%S A066549 2,35,711,1317,19232,931374,1434753,59616771,737983899,7101103107,
%T A066549 10911312713,113713914915,1157163167173,17918119119319,
%U A066549 719921122322722,9233239241251257,26326927127728128,329330731131331733
%N A066549 Let N = 235711171923293137..., the concatenation of the primes. a(n) is the n-digit number formed from the digits of N starting from the {n(n-1)/2 +1}th digit. Omit any leading zeros.
%H A066549 Harvey P. Dale, <a href="/A066549/b066549.txt">Table of n, a(n) for n = 1..1000</a>
%t A066549 Module[{nn=500,cp},cp=Flatten[IntegerDigits/@Prime[Range[nn]]];Table[ FromDigits[ Take[cp,{(2-n+n^2)/2,(n(n+1))/2}]],{n,(Sqrt[1+8nn]-1)/2}]] (* _Harvey P. Dale_, Jul 07 2016 *)
%Y A066549 Cf. A033308, A066547.
%K A066549 nonn,base
%O A066549 1,1
%A A066549 _Amarnath Murthy_, Dec 16 2001
%E A066549 More terms from _Sascha Kurz_, Jan 28 2003