Alas, no. Type 'man 5 crontab' for the gory details, but in summary, no mathematics is possible. The /2 means "every second occasion specified before the slash". In your case, * for minutes means the full range of minutes: 0-59. Therefore /2 means every second minute. For weeks, crontab doesn't support ranges (eg 0-52), so use of a / is meaningless.
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