479 B
479 B
The arithmetic sequence, 1487, 4817, 8147
, in which each of the terms increases by 3330
, is unusual in two ways:
- (i) each of the three terms are prime, and,
- (ii) each of the 4-digit numbers are permutations of one another.
There are no arithmetic sequences made up of three 1-, 2-, or 3-digit primes, exhibiting this property, but there is one other 4-digit increasing sequence.
What 12-digit number do you form by concatenating the three terms in this sequence?