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 A262513 Numbers where A049820 takes a unique value; numbers n for which A060990(A049820(n)) = 1. 4
 5, 6, 7, 8, 11, 14, 17, 18, 20, 22, 23, 24, 27, 32, 34, 35, 40, 43, 46, 47, 50, 51, 57, 58, 61, 65, 72, 73, 77, 79, 81, 84, 86, 87, 88, 92, 93, 94, 96, 97, 98, 99, 101, 102, 103, 105, 107, 114, 116, 119, 120, 123, 125, 130, 135, 137, 143, 151, 154, 155, 158, 160, 163, 164, 173, 175, 177, 179, 184, 187, 191, 193, 194, 197, 198, 200, 203, 204, 206, 209, 210, 212 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequence A262512 sorted into ascending order. Numbers n such that there is no other number k for which A049820(k) = A049820(n). LINKS Antti Karttunen, Table of n, a(n) for n = 1..45700 MATHEMATICA lim = 212; s = Table[n - DivisorSigma[0, n], {n, 2 lim + 3}]; t = Length@ Position[s, #] & /@ Range[0, lim]; Position[t[[# + 1]] & /@ Take[s, lim], 1] // Flatten (* Michael De Vlieger, Sep 29 2015, after Wesley Ivan Hurt at A049820 *) PROG (Scheme, with Antti Karttunen's IntSeq-library) (define A262513 (MATCHING-POS 1 1 (lambda (n) (= 1 (A060990 (A049820 n)))))) CROSSREFS Cf. A060990, A049820, A262511, A262512. Cf. A262509 (a subsequence). Sequence in context: A115839 A200259 A339746 * A130206 A178502 A047322 Adjacent sequences:  A262510 A262511 A262512 * A262514 A262515 A262516 KEYWORD nonn AUTHOR Antti Karttunen, Sep 25 2015 STATUS approved

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Last modified August 14 23:38 EDT 2022. Contains 356122 sequences. (Running on oeis4.)