1274665domain: NAppears in sequencesPentagonal numbers (A000326) whose digit reversal is a brilliant number (A078972).at n=25A115680Odd multiplicative orders of 2+-i modulo primes p == 3 (mod 4).at n=32A385217Multiplicative orders of 2+-i modulo p == 3 (mod 4) that are not divisible by 2 or 3.at n=9A385219