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Square pyramorphic numbers: suppose the k-th square pyramidal number S(k) (A000330) ends in k; sequence gives value of S(k).

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`%I #13 Dec 15 2017 17:34:55
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`%S 1,55,5525,22140,93665,173880,1378160,3822225,19096385,21413400,
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`%T 58695560,81575625,161553785,170986800,295372960,555371185,5595682560,
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`%U 6032742625,21341334000,46478345185,94121656560,96947076625
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`%N Square pyramorphic numbers: suppose the k-th square pyramidal number S(k) (A000330) ends in k; sequence gives value of S(k).
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`%D C. Pickover, Wonders of Numbers, Oxford University Press, NY, 2001, pp. 158-160.
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`%H C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," <a href="http://www.zentralblatt-math.org/zmath/en/search/?q=an:0983.00008&format=complete">Zentralblatt review</a>
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`%e 55 is square pyramorphic because it is the 5th square pyramidal number and ends in 5. 173880 is square pyramorphic because it is the 80th square pyramidal number and ends in 80.
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`%Y A093534 gives values of k. Cf. A000330.
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`%K nonn
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`%O 1,2
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`%A _Jason Earls_, Mar 18 2001
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