The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A354163 Index of A354162(n) in A090252. 3
 15, 29, 59, 63, 65, 121, 131, 193, 239, 241, 243, 255, 257, 265, 387, 479, 483, 487, 489, 515, 527, 529, 531, 775, 777, 959, 961, 967, 969, 977, 979, 1023, 1031, 1055, 1059, 1063, 1143, 1551, 1553, 1555, 1921, 1923, 1935, 1937, 1939, 1951, 1953, 1955, 1959, 1961, 2047, 2063, 2064, 2111, 2113, 2119, 2127, 2288, 3073, 3105, 3107, 3111, 3113, 3839 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..64. PROG (Python) from itertools import count, islice from collections import deque from math import gcd, lcm from sympy import factorint def A354163_gen(): # generator of terms aset, aqueue, c, b, f, i = {1}, deque([1]), 2, 1, True, 1 while True: for m in count(c): if m not in aset and gcd(m, b) == 1: i += 1 if m % 2 and len(fm := factorint(m)) == sum(fm.values()) == 2: yield i aset.add(m) aqueue.append(m) if f: aqueue.popleft() b = lcm(*aqueue) f = not f while c in aset: c += 1 break A354163_list = list(islice(A354163_gen(), 25)) # Chai Wah Wu, May 31 2022 CROSSREFS Cf. A090252, A354159, A354160, A354161, A354162. Sequence in context: A131877 A354161 A211324 * A146427 A202512 A014095 Adjacent sequences: A354160 A354161 A354162 * A354164 A354165 A354166 KEYWORD nonn AUTHOR N. J. A. Sloane, May 30 2022 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 10 19:02 EST 2023. Contains 367717 sequences. (Running on oeis4.)