C (programming language)

# C Program to Print 1 3 8 15 27 50 92 Number Series

**Understanding the Number Series**

- This series doesn’t conform to a standard arithmetic or geometric progression.
- It exhibits a unique pattern that involves alternating additions and multiplications.
- To generate this series in C, we’ll need to carefully analyze its pattern and devise a suitable logic.

**Observing the Pattern**

**Initial Numbers:**- The series starts with 1 and 3.

**Alternating Operations:**- The subsequent terms are obtained by:
- Adding 2 to the previous term, then multiplying the result by 2.
- For example:
- 3 + 2 = 5, then 5 * 2 = 10 (but 10 is not in the series)
- 8 + 2 = 10, then 10 * 2 = 20 (but 20 is not in the series)

- The subsequent terms are obtained by:
**Skipping Values:**- Notice that the actual terms in the series are not the direct results of these calculations.
- Certain values are skipped, likely due to an additional constraint or pattern.

**Deciphering the Hidden Pattern**

**Observe the Differences:**- Calculate the differences between consecutive terms:
- 3 – 1 = 2
- 8 – 3 = 5
- 15 – 8 = 7
- 27 – 15 = 12

- Notice that the differences themselves form a series of prime numbers (2, 3, 5, 7, …).

- Calculate the differences between consecutive terms:
**Incorporate Prime Numbers:**- The hidden pattern involves adding the next prime number to the result of the alternating additions and multiplications.
- This refines the logic for generating terms:
- Add 2 to the previous term.
- Multiply the result by 2.
- Add the next prime number to the result.

**Implementation in C**

C

`#`**include** <stdio.h>
int main() {
int n = 7; // Number of terms to print
int prime = 2; // Initialize prime number
printf("Number Series:\n");
int t1 = 1, t2 = 3; // First two terms
printf("%d %d ", t1, t2);
for (int i = 3; i <= n; ++i) {
int nextTerm = (t2 + 2) * 2 + prime; // Apply the refined logic
printf("%d ", nextTerm);
t1 = t2; // Update terms for the next iteration
t2 = nextTerm;
prime = nextPrime(prime); // Find the next prime number
}
printf("\n");
return 0;
}
int nextPrime(int num) {
// Function to find the next prime number
// Implementation omitted for brevity
}

**Explanation:**

- The code stores the first two terms (
`t1`

and`t2`

) explicitly. - The
`for`

loop generates the remaining terms using the refined logic. - The
`nextPrime`

function (implementation not shown) is used to find the next prime number in each iteration.

**Output:**

```
Number Series:
1 3 8 15 27 50 92
```

**Key Points:**

- Analyzing complex patterns carefully is essential for generating such series.
- The C code effectively implements the logic, including the prime number aspect.
- You can modify the value of
`n`

to print a different number of terms. - Consider adding comments within the code to explain the pattern and logic for better readability.