The numbers are in an arithmetic sequence (common difference = 6). Since there are 5 of them, their mean is the middle number: 79.
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79
53 59 61 67 71 73 79 83 89 97.
61, 67, 71, 73, 79, 83, 89, 97, so 79 is nearest
47, 53, 59, 61, 57, 71, 73, 79
Any number except 61 67 71 73 and 79 which are prime numbers
53 59 61 67 71 73 79 83 89 97
53 59 61 67 71 73 79 83 89 97.
67, 71, 73, 79, 83, 89
61 67 71 73 79.
They are: 67, 71, 73, 79
61, 67, 71, 73, 79.
53 59 61 67 71 73 79 83 89 97