A138756 - OEIS

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A138756

Indices of record values in A138753 (a "prime" variation of the Collatz (3n+1) problem).

1, 2, 3, 8, 11, 17, 18, 27, 42, 72, 125, 219, 221, 401 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`"Indices of ..." is equivalent to "starting values for ..."`
	FORMULA	`a(n) = min { k \| A138753(k) = A171938(n) }` `Equals { m \| A138753(k) < A138753(m) for all k<m }`
	PROG	`(PARI) m=0; for( i=1, #A138753, A138753[i] > m \| next; m=A138753[i]; print1(i", "))`
	CROSSREFS	`Cf. A124123, A138750-A138754, A171938, A006877(analogue for Collatz problem).` `Sequence in context: A039000 A059671 A119116 * A091076 A112595 A041075` `Adjacent sequences: A138753 A138754 A138755 * A138757 A138758 A138759`
	KEYWORD	`more,nonn`
	AUTHOR	`M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 01 2008`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.