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`%I #10 Mar 09 2020 20:58:30
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`%S 3,4,8,14,32,34,41,42,46,47,49,53,58,63,66,67,69,71,76,79,82,86,89,90,
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`%T 100,101,102,110,113,117,124,129,141,151,159,168,175,178,183,186,192,
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`%U 195,205,216,217,219,232,241,247,250,252,253,255,258,261,263,265,271,284,293,297,298
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`%N Index of triangular numbers that are sum of two pentagonal numbers (A332984).
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`%C The index of a triangular number T is the integer n such that T = n*(n+1)/2.
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`%H Peter Kagey, <a href="/A332985/b332985.txt">Table of n, a(n) for n = 1..1000</a>
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`%Y Cf. A000217 (triangular numbers), A000326 (pentagonal numbers), A332987 (sums of two nonzero pentagonal numbers).
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`%K nonn,easy
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`%O 1,1
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`%A _Olivier GĂ©rard_, Mar 05 2020
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