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A119959
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p^2-p+1 central polygonal numbers with prime indices A002061[Prime[n]].
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4
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3, 7, 21, 43, 111, 157, 273, 343, 507, 813, 931, 1333, 1641, 1807, 2163, 2757, 3423, 3661, 4423, 4971, 5257, 6163, 6807, 7833, 9313, 10101, 10507, 11343, 11773, 12657, 16003, 17031, 18633, 19183, 22053, 22651, 24493, 26407, 27723, 29757, 31863
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Prime a(n) belong to A074268[n] = {3,7,43,157,4423,6163,19183,22651,26407,37057,113233,...} that is a subset of A002383[n], A087126[n], A034915[n], A085104[n].
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FORMULA
| a(n) = Prime[n]^2 - Prime[n] + 1.
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MATHEMATICA
| Table[Prime[n]^2-Prime[n]+1, {n, 1, 100}]
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CROSSREFS
| Cf. A002061, A074268, A002383, A087126, A034915, A085104.
Sequence in context: A097162 A128402 A018689 * A018712 A183936 A027151
Adjacent sequences: A119956 A119957 A119958 * A119960 A119961 A119962
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KEYWORD
| nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 02 2006
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