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A085767
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Smallest m such that n divides the pentagonal number A000326(m).
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0
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1, 3, 3, 3, 2, 3, 5, 11, 9, 7, 4, 3, 9, 7, 12, 11, 6, 27, 13, 27, 12, 4, 8, 27, 17, 35, 27, 19, 10, 12, 21, 43, 15, 23, 5, 27, 25, 19, 9, 27, 14, 12, 29, 11, 27, 8, 16, 75, 33, 67, 6, 35, 18, 27, 15, 75, 51, 39, 20, 27, 41, 31, 54, 43, 22, 15, 45, 40, 54, 7, 24, 27, 49, 99, 42, 19, 26, 39
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| Let pe(m)=m*(3m-1)/2. The pe(1)=1, pe(2)=5, pe(3)=12. As pe(3) is the first divisible by 6, a(6)=3.
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PROG
| (PARI) pe(n)=n*(3*n-1)/2 for (n=1, 50, c=1; while (pe(c)%n!=0, c++); print1(c", "))
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CROSSREFS
| Cf. A011772 (triangular numbers), A019554 (squares).
Sequence in context: A075074 A166007 A087497 * A082127 A031354 A200777
Adjacent sequences: A085764 A085765 A085766 * A085768 A085769 A085770
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KEYWORD
| nonn
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AUTHOR
| Jon Perry (perry(AT)globalnet.co.uk), Jul 22 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 10 2005
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