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A326740 Numbers which converge to 7 under repeated application of the powertrain map of A133500. 10
7, 71, 75, 107, 117, 127, 137, 147, 157, 167, 177, 187, 197, 207, 307, 407, 507, 523, 543, 607, 707, 711, 723, 747, 751, 807, 907, 1071, 1075, 1171, 1175, 1271, 1275, 1371, 1375, 1471, 1475, 1571, 1575, 1671, 1675, 1771, 1775, 1871, 1875, 1971, 1975, 2071 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
75 -> 7^5 = 16807 -> 1^6*8^0*7 = 7.
CROSSREFS
Sequence in context: A111462 A045713 A090155 * A107163 A179784 A142037
KEYWORD
nonn,base,easy
AUTHOR
Martin Renner, Jul 22 2019
STATUS
approved

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Last modified March 29 09:14 EDT 2024. Contains 371268 sequences. (Running on oeis4.)