This kata is inspired on the problem #50 of the Project Euler. 

The prime ``` 41```  is the result of the sum of many consecutive primes.

In fact, ``` 2 + 3 + 5 + 7 + 11 + 13 = 41 , (6 addens)   ``` 

Furthermore, the prime ``` 41```  is the prime below ``` 100 (val_max)```  that has the longest chain of consecutive prime addens.

The prime with longest chain of addens for ```val_max = 500``` is ```499``` with ```17``` addens. 

In fact:
```3+5+7+11+13+17+19+23+29+31+37+41+43+47+53+59+61= 499```

Find the function ```prime_maxlength_chain()```(primeMaxlengthChain() javascript), that receives an argument ```val_max```, the upper limit, all the found primes should be less than ```val_max``` and outputs this found prime.

Let's see some cases:
```python
prime_maxlength_chain(100) == [41]
prime_maxlength_chain(500) == [499]
```
If we have more than one prime with these features, the function should output an array with the found primes sorted.
```python
prime_maxlength_chain(499) == [379, 491]
```
Random Tests for `val_max` (`valMax`)
```
100 ≤ val_max ≤ 500.000
```
Enjoy it!

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'limit = 500000\nsieve = [0]*2+list(range(2,limit))\nfor i in range(2,limit):\n    for j in range(i*i,limit,i):\n        sieve[j]=0\nprimes = [i for i in sieve if i]\n\ndef prime_maxlength_chain(n):\n    req = [i for i in primes if i < n]\n    P = set(req)\n    D = {}\n    found = []\n    \n    for i, j in enumerate(req):\n        D[j] = [0, 0]\n        for k in list(D):\n            o, p = D[k]\n            if o in P : found.append([o, p])\n            if o + j > n:\n                del D[k]\n                continue\n            D[k][0] += j\n            D[k][1] += 1\n    \n    m = max(found, key=lambda x: x[1])[1]\n    return [i[0] for i in found if i[1] == m]'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'prime_maxlength_chain'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 12262