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.
2, 35, 711, 1317, 19232, 931374, 1434753, 59616771, 737983899, 7101103107, 10911312713, 113713914915, 1157163167173, 17918119119319, 719921122322722, 9233239241251257, 26326927127728128, 329330731131331733
Offset: 1
Links
- Harvey P. Dale, Table of n, a(n) for n = 1..1000
Programs
-
Mathematica
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 *)
Extensions
More terms from Sascha Kurz, Jan 28 2003