A105298 Primes formed by concatenation of 7 consecutive triangular numbers.

1596165317111770183018911953, 6216632864416555667067866903, 33930341913445334716349803524535511, 38226385033878139060393403962139903, 1066530106799110694531070916107238010738451075311, 1119756112125311227511124250112575011272511128753

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Example

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.

Mathematica

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

Crossrefs

Sequence in context: A146561 A181309 A095448 * A003853 A003846 A105301

Adjacent sequences: A105295 A105296 A105297 * A105299 A105300 A105301

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 25 2005

Extensions

More terms from Harvey P. Dale, Mar 17 2013

Status

approved