cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-4 of 4 results.

A138870 First 3 digits of n-th even superperfect number A061652(n).

Original entry on oeis.org

2, 4, 16, 64, 409, 655, 262, 107, 115, 309, 811, 850, 343, 265, 520, 737, 223, 129, 953, 142, 239, 173, 140, 215, 224, 201, 427, 268, 260, 256, 373, 870, 647, 206, 407, 311, 637, 218, 462, 629, 149, 610, 157, 622, 101, 849, 158
Offset: 1

Views

Author

Omar E. Pol, Apr 02 2008

Keywords

Comments

Also, first 3 digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

Crossrefs

Cf. A019279, A061652, A138864, A138867, A138871, A138872, A138876.

Extensions

a(12)-a(31) from R. J. Mathar, Feb 05 2010
a(32)-a(41) from Max Alekseyev, Feb 11 2012
a(42)-a(47) from Jinyuan Wang, Mar 14 2020

A138868 Last two digits of n-th even superperfect number A061652(n).

Original entry on oeis.org

2, 4, 16, 64, 96, 36, 44, 24, 76, 56, 64, 64, 76, 64, 44, 4, 76, 36, 96, 4, 56, 76, 96, 36, 76, 56, 36, 4, 4, 56, 24, 44, 96, 64, 56, 76, 36, 96, 36, 24, 4, 24, 36, 36, 64, 76, 56
Offset: 1

Views

Author

Omar E. Pol, Apr 02 2008

Keywords

Comments

Also, last two digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

Crossrefs

Cf. A019279, A061652, A138867, A138869, A138870, A138874.

Extensions

More terms from Jinyuan Wang, Mar 14 2020

A138869 Concatenation of first two digits and last two digits of n-th even superperfect number A061652(n).

Original entry on oeis.org

22, 44, 1616, 6464, 4096, 6536, 2644, 1024, 1176, 3056, 8164, 8564, 3476, 2664, 5244, 7304, 2276, 1236, 9596, 1404, 2356, 1776, 1496, 2136, 2276, 2056, 4236, 2604, 2604, 2556, 3724, 8744, 6496, 2064, 4056, 3176, 6336, 2196, 4636, 6224, 1404, 6124, 1536, 6236, 1064, 8476, 1556
Offset: 1

Views

Author

Omar E. Pol, Apr 02 2008

Keywords

Comments

Also, concatenation of first two digits and last two digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

Crossrefs

Cf. A019279, A061652, A138863, A138867, A138868, A138875.

Extensions

More terms from Jinyuan Wang, Mar 14 2020

A138871 Last 3 digits of n-th even superperfect number A061652(n).

Original entry on oeis.org

2, 4, 16, 64, 96, 536, 144, 824, 976, 56, 64, 864, 576, 64, 544, 504, 176, 536, 496, 304, 56, 776, 96, 736, 376, 256, 336, 104, 504, 656, 224, 944, 296, 264, 856, 576, 136, 896, 536, 24, 704, 624, 936, 936, 464, 376, 256, 976
Offset: 1

Views

Author

Omar E. Pol, Apr 02 2008

Keywords

Comments

Also, last 3 digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

Crossrefs

Cf. A019279, A061652, A138865, A138867, A138870, A138872.

Formula

a(n) = 2^(A000043(n)-1) mod 1000. - Max Alekseyev, Feb 16 2024

Extensions

More terms from R. J. Mathar, Feb 05 2010
a(40)-a(41) from Max Alekseyev, Feb 11 2012
a(42)-a(47) from Jinyuan Wang, Mar 14 2020
a(48) from Max Alekseyev, Feb 16 2024
Showing 1-4 of 4 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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