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Search: id:A087202
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| A087202 |
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a(n) is the smallest m such that m > A037153(n) and n!+ m is prime. |
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4
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| 4, 5, 7, 7, 11, 13, 19, 31, 23, 19, 19, 43, 73, 41, 149, 41, 53, 61, 109, 37, 37, 71, 109, 193, 97, 173, 59, 101, 229, 163, 241, 83, 139, 103, 83, 577, 397, 47, 269, 61, 211, 107, 97, 89, 379, 149, 269, 83, 137, 167, 281, 89, 79, 443, 229, 157, 179, 563, 389, 277
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OFFSET
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1,1
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COMMENT
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a(n) is the second m (first m is A037153(n)) such that m > 1 and n!+ m is prime. For 1 < n < 630,a(n) is prime,I guess for n > 1,a(n) (compare the conjecture about A037153) is prime.
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FORMULA
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A037153[n_] := (For[m=Prime[PrimePi[n]+1], !PrimeQ[n!+m], m++ ]; m); a[n_] := (For[m=A037153[n]+1, !PrimeQ[n!+m], m++ ]; m)
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MATHEMATICA
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A037153[n_] := (For[m=Prime[PrimePi[n]+1], !PrimeQ[n!+m], m++ ]; m); a[n_] := (For[m=A037153[n]+1, !PrimeQ[n!+m], m++ ]; m); Table[a[n], {n, 60}]
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CROSSREFS
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Cf. A037153, A005235, A087200.
Sequence in context: A088298 A075992 A022294 this_sequence A010666 A164515 A047494
Adjacent sequences: A087199 A087200 A087201 this_sequence A087203 A087204 A087205
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KEYWORD
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easy,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Sep 01 2003
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