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 A325309 Square array read by downward antidiagonals: A(n, k) is the k-th Niven number (or Harshad number) in base n. 0
 1, 2, 1, 4, 2, 1, 6, 3, 2, 1, 8, 4, 3, 2, 1, 10, 6, 4, 3, 2, 1, 12, 8, 6, 4, 3, 2, 1, 16, 9, 8, 5, 4, 3, 2, 1, 18, 10, 9, 6, 5, 4, 3, 2, 1, 20, 12, 12, 8, 6, 5, 4, 3, 2, 1, 21, 15, 16, 10, 10, 6, 5, 4, 3, 2, 1, 24, 16, 18, 12, 12, 7, 6, 5, 4, 3, 2, 1, 32, 18 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS Wikipedia, Harshad number EXAMPLE The array starts as follows: 1, 2, 4, 6, 8, 10, 12, 16, 18, 20, 21, 24, 32, 34, 36, 40, 42, 48, 55, 60 1, 2, 3, 4, 6,  8,  9, 10, 12, 15, 16, 18, 20, 21, 24, 25, 27, 28, 30, 32 1, 2, 3, 4, 6,  8,  9, 12, 16, 18, 20, 21, 24, 28, 30, 32, 33, 35, 36, 40 1, 2, 3, 4, 5,  6,  8, 10, 12, 15, 16, 18, 20, 24, 25, 26, 27, 28, 30, 32 1, 2, 3, 4, 5,  6, 10, 12, 15, 18, 20, 24, 25, 30, 36, 40, 42, 44, 45, 48 1, 2, 3, 4, 5,  6,  7,  8,  9, 12, 14, 15, 16, 18, 21, 24, 27, 28, 30, 32 1, 2, 3, 4, 5,  6,  7,  8, 14, 16, 21, 24, 28, 32, 35, 40, 42, 48, 49, 56 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 12, 16, 18, 20, 24, 27, 28, 30, 32, 36 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 15, 20, 22, 24, 25, 30, 33, 35 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 22, 24, 33, 36, 44, 48, 55, 60 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 18, 24, 26, 27 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 26, 28, 39, 42, 52, 56 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 21, 28, 30, 32 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 30, 32 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 24 1, 2, 3, 4, 5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 34, 36 PROG (PARI) row(n, terms) = my(i=0); for(x=1, oo, if(i >= terms, break); if(x%sumdigits(x, n)==0, print1(x, ", "); i++)) array(rows, cols) = for(x=2, rows+1, row(x, cols); print("")) array(18, 20) \\ Print initial 18 rows and 20 columns of array CROSSREFS Cf. A049445 (row 2), A064150 (row 3), A064438 (row 4), A064481 (row 5), A245802 (row 8), A005349 (row 10). Cf. A005349. Sequence in context: A135152 A329504 A147542 * A211956 A128177 A087738 Adjacent sequences:  A325306 A325307 A325308 * A325310 A325311 A325312 KEYWORD nonn,tabl,base,easy AUTHOR Felix FrÃ¶hlich, Sep 06 2019 STATUS approved

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Last modified June 24 17:51 EDT 2021. Contains 345419 sequences. (Running on oeis4.)