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.

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A087294 Primes resulting from A087293.

Original entry on oeis.org

113, 613, 24421, 2042221, 60731221, 102975601, 253102501, 327449641, 722798221, 2284271641, 46414646521, 57358506301, 89249322541, 129933236221, 185045469601, 215232948901, 323617365541, 554037063901, 732039110041, 2373042229801, 3076710505441, 3443735055601
Offset: 1

Views

Author

Ray Chandler, Aug 31 2003

Keywords

Examples

			113 is in the sequence because ((prime(2)*prime(3))^2 + 1)/2 = ((3*5)^2 + 1)/2 = 113 is prime.
		

Crossrefs

Extensions

Offset changed to 1 and more terms from Jinyuan Wang, Aug 06 2021

A372313 Table read by antidiagonals: A(n,1) = 2n-1, and for k > 1, A(n,k) = A372289(A(n,k-1)+A(n,1)).

Original entry on oeis.org

1, 5, 3, 13, 13, 5, 29, 341, 21, 7, 61, 2773, 53, 29, 9, 125, 22229, 117, 149, 37, 11, 253, 177877, 245, 629, 93, 45, 13, 509, 1423061, 501, 2549, 205, 469, 53, 15, 1021, 11384533, 1013, 10229, 429, 15701, 133, 61, 17, 2045, 91076309, 2037, 40949, 877, 503125, 293, 309, 69, 19
Offset: 1

Views

Author

Ali Sada, Apr 26 2024

Keywords

Comments

Conjecture: if A(n,1) is congruent to 33 (mod 100), then all terms on the n-th row are congruent to 33 (mod 100).

Examples

			A(3,1) = 5. A(3,2) = A372289(5+5) = 21. A(3,3) = A372289(21+5) = 53. A(3,4) = A372289(53+5) = 117.
Table begins:
  1,  5,   13,   29,     61,        125,          253,           509, ...
  3,  13,  341,  2773,   22229,     177877,       1423061,       11384533, ...
  5,  21,  53,   117,    245,       501,          1013,          2037, ...
  7,  29,  149,  629,    2549,      10229,        40949,         163829, ...
  9,  37,  93,   205,    429,       877,          1773,          3565, ...
  11, 45,  469,  15701,  503125,    16100693,     515222869,     16487132501, ...
  13, 53,  133,  293,    613,       1253,         2533,          5093, ...
  15, 61,  309,  1301,   5269,      21141,        84629,         338581, ...
  17, 69,  173,  381,    797,       1629,         3293,          6621, ...
  19, 77,  3413, 27477,  219989,    1760085,      14080853,      112646997, ...
		

Crossrefs

Previous Showing 31-32 of 32 results.