Hi I have a vector like that

readCsvFile$V1
 [1]  30  31  32  33  34  35  36  37  38  39 310 311 312 313 314 315 316 317 318
[20] 319 320 321  20  21  22  23  24  25  26  27  28  29 210 211 212 213 214 215
[39] 216 217 218 219 220 221 222 223  40  41  42  43  44  45  46  47  48  49 410
[58] 411 412 413 414 415 416 417 418 419 420 421


and I am looking to find where the number 31 is located. So I need one function to return me the index of where the number 31 is.
Is there a function for that in R?

Regards
Alex
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