

A105294


Primes formed by concatenation of 3 consecutive triangular numbers.


1



210231253, 496528561, 630666703, 780820861, 99010351081, 495050505151, 918093169453, 9730987010011, 120901224612403, 135301369513861, 201002030120503, 223662257822791, 368563712837401, 379503822638503
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000


EXAMPLE

a(1)=210231253 because 210231253 is the prime formed by concatenation of 3 consecutive triangular numbers i.e. 210,231 and 253.


MATHEMATICA

Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Accumulate[ Range[300]], 3, 1], PrimeQ] (* Harvey P. Dale, Sep 29 2011 *)


CROSSREFS

Sequence in context: A187440 A092379 A233614 * A288079 A037253 A064588
Adjacent sequences: A105291 A105292 A105293 * A105295 A105296 A105297


KEYWORD

base,nonn


AUTHOR

Shyam Sunder Gupta, Apr 25 2005


STATUS

approved



