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Example: First Five Terms of an=2n+1a_n = 2^n + 1

Find the first five terms of the sequence whose general term is an=2n+1a_n = 2^n + 1 by substituting n=1,2,3,4,5n = 1, 2, 3, 4, 5:

  • a1=21+1=3a_1 = 2^1 + 1 = 3
  • a2=22+1=5a_2 = 2^2 + 1 = 5
  • a3=23+1=9a_3 = 2^3 + 1 = 9
  • a4=24+1=17a_4 = 2^4 + 1 = 17
  • a5=25+1=33a_5 = 2^5 + 1 = 33

The first five terms are 3,5,9,17,333, 5, 9, 17, 33. In this sequence the variable nn appears as an exponent, so the terms grow rapidly as nn increases.

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Updated 2026-05-26

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Ch.12 Sequences, Series and Binomial Theorem - Intermediate Algebra @ OpenStax

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