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A309672 Composite terms of A007755. 0
2329, 4369, 10537, 35209, 281929, 1114129, 8978569, 16843009, 143163649, 286331153, 1086374209, 4295098369, 9198250129, 18325194049, 36507844609, 73016672273, 139055899009, 277033877569, 586397253889, 1103840280833, 4673067091009, 9382516064513, 17868687216769 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
10537 is a term because it is composite (= 41*257) and the totient (A000010) iterating "trajectory" starting from 10537 and ending in 1 is longer (length 15) than any similar trajectory starting from a (prime or nonprime) N < 10537.
LINKS
CROSSREFS
Sequence in context: A355420 A232107 A186058 * A238175 A203344 A178552
KEYWORD
nonn
AUTHOR
Jeppe Stig Nielsen, Oct 05 2019
STATUS
approved

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Last modified April 14 10:04 EDT 2024. Contains 371657 sequences. (Running on oeis4.)