Need this series hint

#1

Need hint to this number pattern.

#2

Here’s the approach:
1 Declare an array for ugly numbers: ugly[n]
2 Initialize first ugly no: ugly[0] = 1
3 Initialize three array index variables i2, i3, i5 to point to 1st element of the ugly array: i2 = i3 = i5 =0;
4 Initialize 3 choices for the next ugly no:
next_mulitple_of_2 = ugly[i2]*2;
next_mulitple_of_3 = ugly[i3]*3
next_mulitple_of_5 = ugly[i5]*5;

Please have a look at this short snippet. Its really easy to understand the logic.

#3

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