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A087972 Maximal term in Collatz-iteration started at 1+3^n. 3
4, 16, 52, 9232, 244, 9232, 2464, 10528, 19684, 88576, 2270104, 1008916, 1594324, 7174456, 65451076, 64570084, 129140164, 1570824736, 1961316232, 8825923024, 10460353204, 47071589416, 105911076184, 423644304724, 66034034786644 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=A025586[1+3^n]

CROSSREFS

Cf. A025586, A087701, A087973.

Sequence in context: A197132 A100774 A107767 * A074409 A056589 A074407

Adjacent sequences:  A087969 A087970 A087971 * A087973 A087974 A087975

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Sep 24 2003

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Last modified February 17 19:02 EST 2012. Contains 206078 sequences.