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 A127640 Triangle read by rows in which row n contains n-1 0's followed by prime(n). 7
 2, 0, 3, 0, 0, 5, 0, 0, 0, 7, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 17, 0, 0, 0, 0, 0, 0, 0, 19, 0, 0, 0, 0, 0, 0, 0, 0, 23, 0, 0, 0, 0, 0, 0, 0, 0, 0, 29, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 37, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A127641 = this sequence * A051731. LINKS EXAMPLE First few rows of the triangle are: 2; 0, 3 0, 0, 5; 0, 0, 0, 7; 0, 0, 0, 0, 11; ... MAPLE A127640 := proc(n, m) if m < n then 0; else ithprime(n) ; fi ; end: for n from 1 to 15 do for m from 1 to n do printf("%d, ", A127640(n, m)) ; od ; od ; # R. J. Mathar, May 19 2007 CROSSREFS Cf. A127641, A127638, A127639, A051731. Sequence in context: A167990 A071391 A102390 * A113303 A080089 A322841 Adjacent sequences:  A127637 A127638 A127639 * A127641 A127642 A127643 KEYWORD nonn,tabl,easy AUTHOR Gary W. Adamson, Jan 21 2007 EXTENSIONS More terms from R. J. Mathar, May 19 2007 STATUS approved

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Last modified October 20 04:37 EDT 2019. Contains 328247 sequences. (Running on oeis4.)