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A114023
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Squares of the form semiprime(k) + k-th triangular number.
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0
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4, 16, 100, 144, 33489, 82369, 41088506209, 95056905969, 196978855329, 4901432910724, 6047212155664, 26601838343809, 247869502464123136
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OFFSET
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1,1
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COMMENTS
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a(14) > 10^18. - Donovan Johnson, Jun 04 2013
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LINKS
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Table of n, a(n) for n=1..13.
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PROG
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(PARI) lista(nn) = {n = -1; for (i=1, nn, if (bigomega(i) == 2, n++; if (issquare(sq=i + n*(n+1)/2), print1(sq, ", ")); ); ); } \\ Michel Marcus, Jun 03 2013
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CROSSREFS
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Cf. A000217, A001358, A111440, A112662.
Sequence in context: A209299 A091040 A029985 * A145823 A121142 A318693
Adjacent sequences: A114020 A114021 A114022 * A114024 A114025 A114026
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KEYWORD
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nonn
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AUTHOR
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Giovanni Teofilatto, Feb 01 2006
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EXTENSIONS
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More terms from Michel Marcus, Jun 03 2013
a(7)-a(13) from Donovan Johnson, Jun 04 2013
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STATUS
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approved
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