The next 2 numbers are 1 and -2 after which, in the real domain, the sequence stops.
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1, 19, 361.
19 times 19 is equal to 361. This can be calculated by multiplying 19 by 19 using the standard multiplication method: 19 x 9 = 171, carry over the 1 and add it to the result of 19 x 10 = 190, which equals 361.
1 x 1805, 5 x 361, 19 x 95
{1}, or {1, 13} or {4, 16, 22} are three possibilities
2n+1