A276942 Square array A(row,col): A(row,1) = A276937(row), and for col > 1, A(row,col) = A003961(A(row,col-1)), read by descending antidiagonals: A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), etc.

2, 3, 6, 5, 15, 9, 7, 35, 25, 10, 11, 77, 49, 21, 14, 13, 143, 121, 55, 33, 18, 17, 221, 169, 91, 65, 75, 22, 19, 323, 289, 187, 119, 245, 39, 26, 23, 437, 361, 247, 209, 847, 85, 51, 30, 29, 667, 529, 391, 299, 1859, 133, 95, 105, 34, 31, 899, 841, 551, 493, 3757, 253, 161, 385, 57, 38, 37, 1147, 961, 713, 589, 6137, 377, 319, 1001, 115, 69, 42

Offset: 2

Author

Antti Karttunen, Sep 25 2016

Keywords

• nonn
• tabl

Comments

The starting offset is 2 because 1 is not included in the array proper. With it the terms are a permutation of A276078.

All terms on each row have the same prime signature.

Examples

			The top left corner of the array:
   2,  3,  5,   7,  11,  13,  17,  19,  23,   29,   31,   37,   41,   43
   6, 15, 35,  77, 143, 221, 323, 437, 667,  899, 1147, 1517, 1763, 2021
   9, 25, 49, 121, 169, 289, 361, 529, 841,  961, 1369, 1681, 1849, 2209
  10, 21, 55,  91, 187, 247, 391, 551, 713, 1073, 1271, 1591, 1927, 2279
  14, 33, 65, 119, 209, 299, 493, 589, 851, 1189, 1333, 1739, 2173, 2537
		

Links

• Antti Karttunen, Table of n, a(n) for n = 2..631; the first 35 antidiagonals of array

Crossrefs

Transpose: A276941.

Leftmost column: A276937, second column: A276938.

Rows from the top: A000040, A006094, A001248 (from 9 onward), A090076, A090090.

Cf. A003961.

Cf. A276078 (sorted into ascending order).

Cf. also A276075, A276955.

Programs

Scheme

(define (A276942 n) (A276941bi (A004736 (- n 1)) (A002260 (- n 1)))) ;; Code for A276941bi given in A276941.

Formula

A(row,1) = A276937(row); for col > 1, A(row,col) = A003961(A(row,col-1)).