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A201818
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Numbers k such that 90*k + 49 is prime.
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15
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1, 2, 4, 5, 8, 9, 11, 12, 15, 16, 17, 18, 19, 22, 26, 29, 30, 33, 34, 38, 39, 41, 43, 45, 50, 51, 52, 54, 55, 57, 60, 67, 72, 73, 74, 78, 79, 85, 86, 87, 89, 92, 93, 95, 96, 97, 100, 103, 107, 108, 109, 110, 111, 115, 121, 123, 125, 131, 134, 136, 137, 141
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OFFSET
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1,2
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COMMENTS
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This sequence was generated by adding 14 Fibonacci-like sequences. Looking at the format 90*k+49 modulo 9 and modulo 10 we see that all entries of A142314 have digital root 2 and last digit 9. (Reverting the process is an application of the Chinese remainder theorem.)
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LINKS
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MATHEMATICA
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Select[Range[0, 200], PrimeQ[90 # + 49] &] (* T. D. Noe, Dec 06 2011 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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