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 1-10 of 26 results. Next

A096519 Solutions to A096509[x]=8, the number of prime-powers [including primes] in neighborhood of x with Ceiling[Log[x]] radius, equals 8.

Original entry on oeis.org

284736, 595953, 855723, 855725, 855726, 855727, 1146785, 1146786, 1146787, 1616612, 1616618, 1616624, 1652884, 1654028, 1718708, 1749272, 1954358, 2176624, 2580658, 2580659, 2580660, 2580661, 2580662, 2831672, 2839942
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Crossrefs

A096512 Numbers k such that A096509(k) = 1; i.e., the number of prime powers (including primes) in the neighborhood of k with radius ceiling(log(k)) is 1.

Original entry on oeis.org

54, 89, 90, 91, 95, 115, 119, 143, 145, 204, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 218, 219, 220, 296, 297, 298, 299, 301, 302, 303, 304, 320, 321, 322, 323, 325, 326, 327, 328, 329, 330, 390, 409, 410, 411, 471, 475, 476, 477, 478, 479, 531
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Crossrefs

A096518 Solutions to A096509[x]=7; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 7.

Original entry on oeis.org

75991, 85841, 88801, 88805, 88807, 88808, 88809, 88810, 88811, 93491, 113155, 113159, 113161, 113165, 163984, 163985, 163986, 165708, 165709, 165710, 165711, 165712, 165713, 165714, 166854, 191454, 191460, 198828, 198829, 198830, 223836
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Crossrefs

A096511 Numbers k such that A096509(k) = 0; i.e., the number of prime powers (including primes) in the neighborhood of k with radius ceiling(log(k)) is 0.

Original entry on oeis.org

1, 300, 324, 895, 896, 897, 898, 899, 1077, 1078, 1079, 1138, 1139, 1140, 1141, 1142, 1268, 1340, 1341, 1342, 1343, 1344, 1345, 1346, 1347, 1348, 1349, 1350, 1351, 1352, 1390, 1646, 1647, 1648, 1768, 1922, 1960, 1961, 1962, 1963, 1964, 2170, 2320, 2321
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Crossrefs

A096513 Numbers k such that A096509(k) = 2; i.e., the number of prime powers (including primes) in the neighborhood of k with radius ceiling(log(k)) is 2.

Original entry on oeis.org

2, 36, 37, 38, 42, 48, 52, 53, 55, 73, 87, 88, 92, 93, 94, 96, 97, 113, 114, 116, 117, 118, 120, 121, 137, 138, 139, 140, 141, 142, 144, 146, 147, 148, 149, 150, 156, 158, 159, 160, 180, 181, 182, 183, 184, 186, 188, 189, 190, 200, 201, 202, 203, 205, 217, 221
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Examples

			k=36 is a term: ceiling(log(36)) = ceiling(3.5835...) = 4, and in [36-4, 36+4] = [32, 40], 32 and 37 are the two corresponding powers of primes.
		

Crossrefs

A096514 Solutions to A096509[x]=3; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 3.

Original entry on oeis.org

12, 13, 15, 17, 18, 19, 20, 22, 24, 32, 34, 35, 39, 40, 41, 43, 44, 46, 47, 49, 50, 51, 56, 57, 58, 59, 60, 61, 65, 67, 70, 71, 72, 74, 75, 77, 79, 80, 81, 82, 83, 85, 86, 98, 99, 100, 101, 103, 107, 109, 110, 111, 112, 122, 131, 133, 134, 135, 136, 151, 152, 153, 154
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Examples

			n=122: in [117,127] {121,125,127} are the 3 corresponding
powers of prime.
		

Crossrefs

A096515 Solutions to A096509[x]=4; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 4.

Original entry on oeis.org

3, 4, 5, 6, 7, 9, 11, 14, 16, 21, 23, 25, 26, 30, 31, 33, 45, 62, 63, 64, 66, 68, 69, 76, 78, 84, 102, 104, 105, 106, 108, 123, 124, 125, 127, 128, 129, 130, 132, 163, 167, 168, 169, 173, 175, 193, 194, 195, 196, 197, 227, 228, 229, 233, 235, 237, 238, 239, 245, 257
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Examples

			n=63: in [58,68], {59,61,64,67} are the 4 corresponding prime powers.
		

A096516 Solutions to A096509[x]=5; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 5.

Original entry on oeis.org

8, 10, 27, 28, 29, 126, 1026, 1283, 1284, 1285, 1295, 1296, 1297, 1299, 1431, 1485, 1486, 1487, 1488, 1489, 1491, 1605, 1613, 1614, 1615, 1869, 1871, 1872, 1873, 1874, 1875, 1995, 2135, 2136, 2137, 2205, 2385, 2685, 2691, 2795, 2796, 2797, 3322, 3458
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Examples

			n=126: in [121,131] {121,125,127,128,131} are the 5 corresponding
powers of prime.
		

Crossrefs

A096517 Solutions to A096509[x]=6; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 6.

Original entry on oeis.org

4792, 5648, 5650, 9429, 13687, 13688, 13689, 14553, 14631, 16063, 16064, 16065, 16066, 16067, 18051, 19423, 19424, 19425, 19426, 19427, 19431, 21021, 22280, 22281, 22282, 24102, 26690, 26691, 26692, 26720, 26721, 26722, 27740, 27741
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Examples

			n=4792: in [4793,4801] {4783,4787,4789,4793,4799,4801} are the 6 corresponding
powers of prime.
		

Crossrefs

A096523 Solutions to A096520[x]>5, that is in neighborhood with c=2^x center and r=Ceiling[Log[2^x]] more than five[6,7,8,..?] primes occur.

Original entry on oeis.org

127, 505, 573, 619, 670, 714, 743, 844, 963
Offset: 1

Views

Author

Labos Elemer, Jul 12 2004

Keywords

Examples

			For the first few terms, the numbers of primes in the corresponding neighborhood of 2^(a[j]) are 6, 6, 8, 6, 6, 6, 6, 7, 6.
		

Crossrefs

Programs

  • Mathematica
    {ta=Table[0, {1000}], u=1}; Do[s=Count[Table[PrimeQ[2^n+i], {i, -Ceiling[Log[2^n]//N], Ceiling[Log[2^n]//N]}], True];If[Greater[s, 5], Print[{n, s}];ta[[u]]=n;u=u+1], {n, 1, 1000}];ta
Showing 1-10 of 26 results. Next