User:4pq1injbok/foo

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401 prime number, tetranacci number, sum of seven consecutive primes (43 + 47 + 53 + 59 + 61 + 67 + 71), sum of nine consecutive primes (29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61), Eisenstein prime with no imaginary part, Mertens function returns 0. Also, area code for Rhode Island, also HTTP status code for an unauthorized request, also in the name of a retirement plan, 401(k)


402 = 2 × 3 × 67, sphenic number, nontotient, Harshad number, also HTTP status code for payment required


403 = 13 × 31, Mertens function returns 0. Also, HTTP status code for forbidden, also in the name of a retirement plan, 403(b)


404 = 22 × 101, Mertens function returns 0, nontotient, noncototient. Also, HTTP status code for file not found, perhaps the most famous HTTP status code of all time.


405 = 34 × 5, Mertens function returns 0, Harshad number, HTTP error code for Method not allowed


406 = 2 × 7 × 29, sphenic number, triangular number, centered nonagonal number, nontotient, untouchable number, also area code for Montana, HTTP error code for Not acceptable


407 = 11 × 37, sum of three consecutive primes (131 + 137 + 139), Mertens function returns 0, Harshad number, HTTP error code for Proxy authentication required


408 = 23 × 3 × 17

  • sum of four consecutive primes (97 + 101 + 103 + 107)
  • sum of eight consecutive primes (37 + 41 + 43 + 47 + 53 + 59 + 61 + 67)
  • Mertens function returns 0,
  • octagonal number
  • untouchable number
  • Harshad number
  • HTTP error code for Request timeout

409 is a prime number, centered triangular number.


410 = 2 × 5 × 41, sphenic number, sum of six consecutive primes (59 + 61 + 67 + 71 + 73 + 79), nontotient, Harshad number, HTTP error code for Gone


411 = 3 × 137, self number, HTTP error code for Length required


412 = 22 × 103, nontotient, noncototient, HTTP error code for recondition failed


413 = 7 × 59, Mertens function returns 0, self number, HTTP error code for Request entity too large


414 = 2 × 32 × 23, Mertens function returns 0, nontotient, Harshad number, HTTP error code for Request URI too long


415 = 5 × 83, it is also the area code for San Francisco, California, HTTP error code for Unsupported media type


416 = 25 × 13, HTTP error code for Requested Range not satisfiable


417 = 3 × 139, HTTP error code for Expectation failed


418 = 2 × 11 × 19, sphenic number, also area code for Quebec


419 prime number, Sophie Germain prime, Eisenstein prime with no imaginary part, highly cototient number, Mertens function returns 0


420 has its own page