A096855 -id:A096855 - cp's OEIS frontend

A096853 a(n) = A062401(2^n-1).

1, 2, 4, 8, 16, 48, 64, 144, 288, 512, 576, 2304, 4096, 10240, 18432, 36288, 65536, 184320, 262144, 552960, 718848, 1492992, 2822400, 9123840, 13418496, 44695552, 68762880, 106168320, 109486080, 580386816, 1073741824, 2155507200, 2366668800, 6920601600, 12081954816

Offset: 1

Labos Elemer, Jul 19 2004

nonn

Amiram Eldar, Table of n, a(n) for n = 1..392

Cf. A000010, A000203, A000225, A062401, A062402, A053287, A075708, A096853, A096854, A096855, A096856.

Table[ EulerPhi[ DivisorSigma[1, 2^n - 1]], {n, 33}]

a(n) = A000010(A000203(A000225(n))). - Michel Marcus, Dec 19 2013

a(n) = A000010(A075708(n)). - Amiram Eldar, Jun 04 2024

Edited and extended by Robert G. Wilson v, Jul 23 2004

a(33)-a(35) from Amiram Eldar, Jun 04 2024

A096854 a(n) = A062402(2^n-1).

Original entry on oeis.org

1, 3, 12, 15, 72, 91, 312, 255, 1240, 1860, 4123, 5080, 26208, 34200, 93600, 65535, 334368, 416560, 1420800, 1596364, 6146800, 5949696, 20485332, 23788842, 120519630, 194016600, 358132380, 458803800, 1674738000, 2166798816, 6045990912, 4294967295, 22739738112, 37862623140

Offset: 1

Labos Elemer, Jul 19 2004

nonn

Amiram Eldar, Table of n, a(n) for n = 1..400

Cf. A000203, A053287, A062401, A062402, A053287, A096853, A096854, A096855, A096856.

Table[DivisorSigma[1, EulerPhi[2^n - 1]], {n, 1, 30}]

a(n) = sigma(eulerphi(2^n-1)); \\ Michel Marcus, Aug 30 2019

a(n) = A000203(A053287(n)). - Amiram Eldar, Jun 04 2024

More terms from Michel Marcus, Aug 30 2019

A096856 a(n) = A062402(2^n+1).

Original entry on oeis.org

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

Labos Elemer, Jul 19 2004

nonn

Amiram Eldar, Table of n, a(n) for n = 0..372

Cf. A000203, A053285, A062401, A062402, A053287, A096853, A096854, A096855.

Table[DivisorSigma[1, EulerPhi[2^n + 1]], {n, 0, 30}]

a(n) = A000203(A053285(n)). - Amiram Eldar, Jun 04 2024

Offset changed to 0, a(0) prepended and three more terms added by Amiram Eldar, Jun 04 2024

cp's OEIS Frontend

A096853 a(n) = A062401(2^n-1).

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A096854 a(n) = A062402(2^n-1).

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A096856 a(n) = A062402(2^n+1).

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