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 A262369 A(n,k) is the n-th prime whose decimal expansion begins with the decimal expansion of k; square array A(n,k), n>=1, k>=1, read by antidiagonals. 14
 11, 2, 13, 3, 23, 17, 41, 31, 29, 19, 5, 43, 37, 211, 101, 61, 53, 47, 307, 223, 103, 7, 67, 59, 401, 311, 227, 107, 83, 71, 601, 503, 409, 313, 229, 109, 97, 89, 73, 607, 509, 419, 317, 233, 113, 101, 907, 809, 79, 613, 521, 421, 331, 239, 127 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Alois P. Heinz, Antidiagonals n = 1..200, flattened EXAMPLE Square array A(n,k) begins: :  11,   2,   3,  41,   5,  61,   7,  83, ... :  13,  23,  31,  43,  53,  67,  71,  89, ... :  17,  29,  37,  47,  59, 601,  73, 809, ... :  19, 211, 307, 401, 503, 607,  79, 811, ... : 101, 223, 311, 409, 509, 613, 701, 821, ... : 103, 227, 313, 419, 521, 617, 709, 823, ... : 107, 229, 317, 421, 523, 619, 719, 827, ... : 109, 233, 331, 431, 541, 631, 727, 829, ... MAPLE u:= (h, t)-> select(isprime, [seq(h*10^t+k, k=0..10^t-1)]): A:= proc(n, k) local l, p;       l:= proc() [] end; p:= proc() -1 end;       while nops(l(k))

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Last modified April 17 14:32 EDT 2021. Contains 343063 sequences. (Running on oeis4.)