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.

A249611 Integers that reach the (15, 8) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).

Original entry on oeis.org

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 22, 23, 24, 27, 28, 29, 30, 34, 37, 38, 39, 40, 51, 55, 56, 59, 60, 65, 66, 70, 71, 72, 75, 78, 83, 84, 85, 86, 87, 89, 90, 94, 95, 107, 108, 109, 110, 111, 113, 114, 117, 118, 120, 123, 124, 131, 132
Offset: 1

Views

Author

Michel Marcus, Nov 02 2014

Keywords

Crossrefs

Cf. A017665, A234534, A249612, A249613, A249614.

Programs

  • PARI
    finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;}
lista(nn, targ=15) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}

A249612 Integers that reach the (448, 127, 128, 255, 144, 403) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).

Original entry on oeis.org

16, 19, 20, 21, 25, 26, 31, 32, 33, 35, 36, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 57, 58, 61, 62, 63, 64, 67, 68, 69, 73, 74, 76, 77, 79, 80, 82, 88, 91, 92, 93, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 112, 115, 116, 119, 122, 125, 126
Offset: 1

Views

Author

Michel Marcus, Nov 02 2014

Keywords

Crossrefs

Cf. A017665, A234534, A249611, A249613, A249614.

Programs

  • PARI
    finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;}
lista(nn, targ=127) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}

A249613 Integers that reach the (1023, 512) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).

Original entry on oeis.org

81, 106, 121, 133, 148, 160, 162, 170, 189, 211, 212, 214, 237, 297, 301, 313, 314, 320, 340, 352, 361, 378, 381, 394, 409, 410, 428, 438, 442, 474, 502, 512, 535, 583, 605, 609, 621, 627, 645, 647, 648, 657, 680, 691, 692, 704, 709, 710, 717, 736, 742, 748
Offset: 1

Views

Author

Michel Marcus, Nov 02 2014

Keywords

Crossrefs

Cf. A017665, A234534, A249611, A249612, A249614.

Programs

  • PARI
    finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;}
lista(nn, targ=512) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}

A249614 Integers that reach the (47360, 29127) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).

Original entry on oeis.org

22521, 28927, 28928, 29109, 29127, 30026, 30032, 35161, 35517, 38833, 38834, 39751, 40192, 40369, 42997, 47353, 47354, 47360, 49341, 56931, 58111, 58112, 62961, 65792, 65919, 72303, 74389, 75345, 79107, 83727, 85024, 87513, 87871, 90368, 90447, 92637, 95235
Offset: 1

Views

Author

Michel Marcus, Nov 02 2014

Keywords

Crossrefs

Cf. A017665, A234534, A249611, A249612, A249613.

Programs

  • PARI
    finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;}
lista(nn, targ=29127) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}
Showing 1-4 of 4 results.

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

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