Consider a sequence made up of the consecutive prime numbers. This infinite sequence would start with: 
```python
"2357111317192329313741434753596167717379..."
```

You will be given two numbers: `a` and `b`, and your task will be to return `b` elements starting from index `a` in this sequence.
```
For example:
solve(10,5) == `19232` Because these are 5 elements from index 10 in the sequence.
```

Tests go up to about index `20000`.

More examples in test cases. Good luck!

Please also try [Simple time difference](https://www.codewars.com/kata/5b76a34ff71e5de9db0000f2)

```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 = "from itertools import count, islice\n                                         # ideone.com/aVndFM\ndef postponed_sieve():                   # postponed sieve, by Will Ness\n    yield 2; yield 3; yield 5; yield 7;  # original code David Eppstein,\n    sieve = {}                           #   Alex Martelli, ActiveState Recipe 2002\n    ps = postponed_sieve()               # a separate base Primes Supply:\n    p = next(ps) and next(ps)            # (3) a Prime to add to dict\n    q = p*p                              # (9) its sQuare\n    for c in count(9,2):                 # the Candidate\n        if c in sieve:               # c's a multiple of some base prime\n            s = sieve.pop(c)         #     i.e. a composite ; or\n        elif c < q:\n             yield c                 # a prime\n             continue\n        else:   # (c==q):            # or the next base prime's square:\n            s=count(q+2*p,2*p)       #    (9+6, by 6 : 15,21,27,33,...)\n            p=next(ps)               #    (5)\n            q=p*p                    #    (25)\n        for m in s:                  # the next multiple\n            if m not in sieve:       # no duplicates\n                break\n        sieve[m] = s                 # original test entry: ideone.com/WFv4f\n\ndef sequence():\n    for d in postponed_sieve():\n        yield from str(d)\n\nsolve = lambda s, l: ''.join(islice(sequence(), s, s+l))"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'solve'
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: 6724