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Search: id:A050662
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| A050662 |
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a(n) is smallest number such that number of primes produced according to rules stipulated in Honaker's A048853 is n. |
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+0
12
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| 90, 20, 2, 1, 29, 23, 11, 13, 117, 101, 107, 387, 177, 357, 1001, 4221, 10759, 11487, 42497, 42189, 317721, 984417, 344253, 1851759
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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A048853 := proc(n::integer) local resul, ddigs, d, c, tmp ; resul := 0 ; ddigs := convert(n, base, 10) ; for d from 1 to nops(ddigs) do for c from 0 to 9 do if c = 0 and d = nops(ddigs) then continue ; else if c <> op(d, ddigs) then tmp := [op(1..d-1, ddigs), c, op(d+1..nops(ddigs), ddigs)] ; tst := sum(op(i, tmp)*10^(i-1), i=1..nops(tmp)) ; if isprime(tst) then resul := resul+1 ; fi ; fi ; fi ; od : od ; RETURN(resul) ; end: A050662 := proc(n::integer) local i; for i from 1 to 10000000 do if A048853(i) = n then RETURN(i) ; fi ; od ; RETURN(-1) ; end : for n from 1 to 90 do print(A050662(n)) ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 25 2006
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CROSSREFS
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Cf. A048853, first terms of A050652-A050661, A050673.
Sequence in context: A058631 A078293 A052999 this_sequence A033410 A008901 A012861
Adjacent sequences: A050659 A050660 A050661 this_sequence A050663 A050664 A050665
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KEYWORD
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nonn,base,more
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1999.
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