λ
Sequence Observatory

55,171

55171
Deficient Odd Prime

Starting at 55,171, the Collatz iteration reaches 1 after 153 steps. The first transition is 165514; the starting value is odd with 2 positive divisors.

Prime Factor Structure

Factorization String 55171
Distinct Prime Factors 1
Square Status No
Abundance Measure Deficient

Analytical Properties

Total Divisors 2
Divisor Sum (σ) 55,172
Proper Divisor Sum 1
Digit Sum / Digital Root 19 (Root: 1)
Adjacent Primes #55163 ← → #55201

Radix Representation

Decimal 55171
Binary 1101011110000011 (16 bits)
Octal 0o153603
Hexadecimal 0xD783

Divisor Catalog (2)

1 55,171

Collatz Trajectory (153 steps to reach 1)

Iterative sequence n → n/2 (if even) or 3n+1 (if odd):

55,171 165,514 82,757 248,272 124,136 62,068 31,034 15,517 46,552 23,276 11,638 5,819 17,458 8,729 26,188 13,094 6,547 19,642 9,821 29,464 14,732 7,366 3,683 11,050 5,525 16,576 8,288 4,144 2,072 1,036 518 259 778 389 1,168 584 292 146 73 220 110 55 166 83 250 125 376 188 94 47 142 71 214 107 322 161 484 242 121 364

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