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# Sequence (estimation IQ 153)

Wed 26 Jul, 2017 10:48 am
Please tell me how to solve.
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whimsical

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Sat 7 Oct, 2017 11:10 am
@puzzlebee,

a(n)=a(n-1)+a(n-2)-d, where d=a(n/3) if 3 divides n, else d=0; 2 initial terms.
And where every third number of the sequence is changed into its alphabetical value: 1, 1, 1, 2, 3, 4, 7, 11, 17, . The sequence ends at 45, since there is no letter in the alphabet with value 71.

1, 1, A,
2, 3, D,
7, 11, Q,
last terms after Q would be 28, 45
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