Table of n, a(n) for n=1..7.
a(1)=36101521 because 36101521 is the prime formed by concatenation of 5 consecutive triangular numbers i.e. 3,6,10,15 and 21.
Sequence in context: A064586 A183593 A183755 * A254389 A254396 A253984
Adjacent sequences: A105293 A105294 A105295 * A105297 A105298 A105299
Shyam Sunder Gupta, Apr 25 2005