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A109944
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a(1) = 1, a(n) = smallest prime number beginning with n if n is composite or vise versa. If n is prime a(n) = 10n.
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0
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1, 20, 30, 41, 50, 61, 70, 83, 97, 101, 110, 127, 130, 149, 151, 163, 170, 181, 190, 2003, 211, 223, 230, 241, 251, 263, 271, 281, 290, 307, 310, 3203, 331, 347, 353, 367, 370, 383, 397, 401, 410, 421, 430, 443, 457, 461, 470, 487, 491, 503, 5101, 521, 530, 541
(list; graph; refs; listen; history; internal format)
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