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Search: id:A076604
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| A076604 |
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a(1)=11, a(n_even)=(a(n-1)^2-1)/2; a(n_odd)=a(n-1)+1. |
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+0
2
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| 11, 60, 61, 1860, 1861, 1731660, 1731661, 1499324909460, 1499324909461, 1123987592065117923655260, 1123987592065117923655261
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OFFSET
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1,1
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COMMENT
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{11, 60, 61}, {61, 1860, 1861}, {1861, 1731660, 1731661}... are sides {a<b<c} of the right triangles, with hypotenuse c=b+1.
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CROSSREFS
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Sequence in context: A139859 A082884 A077036 this_sequence A076676 A044149 A044530
Adjacent sequences: A076601 A076602 A076603 this_sequence A076605 A076606 A076607
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Oct 21 2002
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