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12, 14, 15, 20, 22, 30, 33, 35, 38, 42, 44, 45, 46, 48, 51, 52, 54, 56, 60, 62, 63, 65, 66, 69, 70, 72, 76, 77, 80, 84, 85, 86, 87, 88, 90, 91, 92, 94, 95, 99, 102, 104, 105, 108, 110, 112, 114, 115, 116, 117, 118, 119, 123, 124, 126, 130, 132, 133, 134, 135, 138, 140, 141, 142, 143, 144, 145, 148, 152, 153, 154, 156
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OFFSET
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1,1
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COMMENTS
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The first term not in A344883 is 60. First terms included in A344883, but not here are: 900, 1260, 1560, 3740, 6552, 6669, etc. (A344694). See also comments in A344975.
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LINKS
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PROG
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(PARI)
A011772(n) = { if(n==1, return(1)); my(f=factor(if(n%2, n, 2*n)), step=vecmax(vector(#f~, i, f[i, 1]^f[i, 2]))); forstep(m=step, 2*n, step, if(m*(m-1)/2%n==0, return(m-1)); if(m*(m+1)/2%n==0, return(m))); }; \\ From A011772
A344875(n) = { my(f=factor(n)~); prod(i=1, #f, (f[1, i]^(f[2, i]+(2==f[1, i]))-1)); };
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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