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 A104245 Suppose n=(p1^e1)(p2^e2)... where p1,p2,... are the prime numbers and e1,e2,... are nonnegative integers. Then we can define Pn(x) = e1 + (e2)*x + (e3)*(x^2) + (e4)*(x^3) + ... + (ek)*(x^(k-1)) + ... The sequence is the table T(x,n)=Pn(x) read by antidiagonals. 3
 0, 0, 1, 0, 1, 1, 0, 1, 2, 2, 0, 1, 3, 2, 1, 0, 1, 4, 2, 4, 2, 0, 1, 5, 2, 9, 3, 1, 0, 1, 6, 2, 16, 4, 8, 3, 0, 1, 7, 2, 25, 5, 27, 3, 2, 0, 1, 8, 2, 36, 6, 64, 3, 4, 2, 0, 1, 9, 2, 49, 7, 125, 3, 6, 5, 1, 0, 1, 10, 2, 64, 8, 216, 3, 8, 10, 16, 3, 0, 1, 11, 2, 81, 9, 343, 3, 10, 17, 81, 4, 1, 0, 1, 12, 2 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,9 COMMENTS This square array is the transpose of A104244, see comments there. LINKS EXAMPLE a(13)=3 because 3=(p1^0)(p2^1)(p3^0)..., so P3(x)=x. Hence a(13) = T(3,3) = P3(3) = 3. The top left corner of the array: 0,  0,  0,   0,   0,    0,    0,    0,    0,    0,      0,     0 1,  1,  1,   1,   1,    1,    1,    1,    1,    1,      1,     1 1,  2,  3,   4,   5,    6,    7,    8,    9,   10,     11,    12 2,  2,  2,   2,   2,    2,    2,    2,    2,    2,      2,     2 1,  4,  9,  16,  25,   36,   49,   64,   81,  100,    121,   144 2,  3,  4,   5,   6,    7,    8,    9,   10,   11,     12,    13 1,  8, 27,  64, 125,  216,  343,  512,  729, 1000,   1331,  1728 3,  3,  3,   3,   3,    3,    3,    3,    3,    3,      3,     3 2,  4,  6,   8,  10,   12,   14,   16,   18,   20,     22,    24 2,  5, 10,  17,  26,   37,   50,   65,   82,   101,   122,   145 1, 16, 81, 256, 625, 1296, 2401, 4096, 6561, 10000, 14641, 20736 3,  4,  5,   6,   7,    8,    9,   10,   11,    12,    13,    14 ... PROG (Scheme) (define (A104245 n) (A104244bi (A004736 n) (A002260 n))) ;; A104244bi given in A104244. ;; Antti Karttunen, Jul 29 2015 CROSSREFS Transpose: A104244. Main diagonal: A090883. Sequence in context: A000209 A170982 A296339 * A185287 A276554 A297323 Adjacent sequences:  A104242 A104243 A104244 * A104246 A104247 A104248 KEYWORD easy,nonn,tabl AUTHOR Olaf Voß, Feb 26 2005 EXTENSIONS Starting offset changed from 0 to 1 by Antti Karttunen, Jul 29 2015 STATUS approved

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Last modified January 18 21:54 EST 2019. Contains 319282 sequences. (Running on oeis4.)