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A078326
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Squareful numbers of the form m*sfk(m)+1, where sfk=A007947 (squarefree kernel).
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2
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9, 289, 676, 9801, 12168, 235225, 332929, 465125, 1825201, 11309769, 384199201, 592192225, 4931691076, 5425069448, 13051463049, 221322261601, 443365544449, 865363202001, 8192480787001, 11968683934832, 13325427460801, 15061377048201, 28821995554248
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n) = u*sfk(u) = v*sfk(v)+1 for appropriate u, v.
The first 23 terms are the same as A118893. - Donovan Johnson, Jul 29 2011
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EXAMPLE
| 9801 = 297*sfk(297) = 297*sfk(11*3^3) = 297*33 = A064549(297) = A064549(140)+1 = 140*sfk(140)+1 = 140*(7*5*2)+1 = 140*70+1 = 9800+1, therefore 9801 is a term.
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CROSSREFS
| Cf. A078310, A064549, A078315, A078325, A118893.
Sequence in context: A012141 A110553 * A118893 A055792 A053935 A086699
Adjacent sequences: A078323 A078324 A078325 * A078327 A078328 A078329
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 23 2002
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EXTENSIONS
| Added two missing terms and a(9)-a(23) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jul 29 2011
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