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Search: id:A120736
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| A120736 |
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A number n is included if it satisfies: the prime p divides n for all p's where p divides d(n), d(n) = number of positive divisors of n divides n. |
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+0
2
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| 1, 2, 6, 8, 9, 10, 12, 14, 18, 22, 24, 26, 30, 34, 36, 38, 40, 42, 46, 54, 56, 58, 60, 62, 66, 70, 72, 74, 78, 80, 82, 84, 86, 88, 90, 94, 96, 102, 104, 106, 108, 110, 114, 118, 120, 122, 126, 128, 130, 132, 134, 136, 138, 142, 146, 150, 152, 154, 156, 158, 166, 168
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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d(26) = 4. 2 is the only prime dividing 4. 2 divides 26, so 26 is in the sequence.
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MAPLE
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isA120736 := proc(n) local d, p; d := numtheory[tau](n) ; p := 2 ; while p <= n do if ( d mod p ) = 0 then if ( n mod p ) <> 0 then RETURN(false) ; fi ; fi ; p := nextprime(p) ; od ; RETURN(true) ; end: for n from 1 to 200 do if isA120736(n) then printf("%d, ", n) ; fi ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 17 2006
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CROSSREFS
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Cf. A120737.
Sequence in context: A003610 A077477 A095879 this_sequence A130099 A047397 A043341
Adjacent sequences: A120733 A120734 A120735 this_sequence A120737 A120738 A120739
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Jun 29 2006
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 17 2006
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