Find the wrong number in the given series : 8, 17, 36, 75, 154, 308

The pattern is ×2+1 starting from 8: 8×2+1=17, 17×2+2=36, 36×2+3=75, 75×2+4=154, 154×2+5=313. But the last term given is 308, which should be 313. Let me verify: 8→17 (+9), 17→36 (+19), 36→75 (+39), 75→154 (+79), 154→308 (+154). The differences themselves nearly double. Alternatively, the pattern could be 2^n + n: 2^3=8, 2^4+1=17, 2^5+4=36, 2^6+11=75, 2^7+26=154... this is complex. Checking the ×2+1 pattern with incrementing addend: 8×2+1=17, 17×2+2=36, 36×2+3=75, 75×2+4=154, 154×2+5=313. Given term is 308, so 308 is wrong; should be 313.