Numerically 2026 is unremarkable yet happy: semiprime with primitive roots

[antononcube (Anton Antonov)]

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[edp (Ed Pegg)]

12×34×5-6-7+8-9 == 2026
1+2+345×6-7×8+9 == 2026
1+2+3-4 (5-(6+7 (8×9))) == 2026
9×8 +7+(6^5)/4 + 3×(2-1) == 2026
34 (56 + 7) - (8 + 9×12) == 2026
0! +(1+2)^(3+4) - 5! +6×7×(8 - 9) == 2026
9+8×7×6! / 5 / 4 - 3 + 2 + 1 + 0! == 2026
1 + 9^3 + 6^4 == 2026
Round[Cosh[9]/2] = 2026
FromContinuedFraction[{45, {90}}]

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[antononcube (Anton Antonov)]

Thank you, Editorial Board!

[antononcube (Anton Antonov)]

More pronounced chord plots:

[edp (Ed Pegg)]

Round[Cosh[9]/2]
is 2026

[antononcube (Anton Antonov)]

SVG version of the happy number trails graph (using Raku and Graphviz):

[srinivasaraghavak (Srinivasa Raghava)]