A276706 Indices of records in A249860.
1, 2, 4, 5, 6, 7, 8, 10, 14, 16, 20, 22, 26, 28, 32, 34, 38, 40, 44, 46, 50, 52, 56, 58, 62, 64, 68, 70, 74, 76, 80, 82, 86, 88, 92, 94, 98, 100, 104, 106, 110, 112, 116, 118, 122, 124, 128, 130, 134, 136, 140, 142, 146, 148, 152, 154, 158, 160, 164, 166
Offset: 1
Keywords
Programs
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PARI
lista(nn) = {rec = 0; for (n=1, nn, an = lcm(n-3, n+3); if (an > rec, rec = an; print1(n, ", ")););} \\ Michel Marcus, Sep 16 2016
Formula
Conjectures: (Start)
a(n) = a(n-1)+a(n-2)-a(n-3) for n>3.
a(n) = (6*n-27-(-1)^n)/2 for n>6.
G.f.: x*(1+x+x^2-x^4+x^7+3*x^8) / ((1-x)^2*(1+x)).
(End)
Comments