A105298 - OEIS

%I #6 Oct 02 2013 15:47:26

%S 1596165317111770183018911953,6216632864416555667067866903,

%T 33930341913445334716349803524535511,

%U 38226385033878139060393403962139903,1066530106799110694531070916107238010738451075311,1119756112125311227511124250112575011272511128753

%N Primes formed by concatenation of 7 consecutive triangular numbers.

%e a(1)=1596165317111770183018911953 because 1596165317111770183018911953 is the prime formed by concatenation of 7 consecutive triangular numbers i.e. 1596,1653,1711,1770,1830,1891 and 1953.

%t Select[FromDigits[Flatten[IntegerDigits[#]]]&/@ Partition[Accumulate[Range[ 2000]],7,1],PrimeQ] (* _Harvey P. Dale_, Mar 17 2013 *)

%K base,nonn

%O 1,1

%A _Shyam Sunder Gupta_, Apr 25 2005

%E More terms from _Harvey P. Dale_, Mar 17 2013