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A096856
a(n) = A062402(2^n+1).
4
1, 3, 7, 12, 31, 42, 124, 224, 511, 847, 1953, 2688, 12264, 18816, 29127, 72540, 131071, 195048, 558523, 1077440, 3164112, 4552020, 10890040, 10342080, 54525848, 73260781, 155671040, 318848400, 1080311232, 964580240, 3070642080, 4340711424, 13722819600, 19039027200
OFFSET
0,2
LINKS
FORMULA
a(n) = A000203(A053285(n)). - Amiram Eldar, Jun 04 2024
MATHEMATICA
Table[DivisorSigma[1, EulerPhi[2^n + 1]], {n, 0, 30}]
KEYWORD
nonn
AUTHOR
Labos Elemer, Jul 19 2004
EXTENSIONS
Offset changed to 0, a(0) prepended and three more terms added by Amiram Eldar, Jun 04 2024
STATUS
approved