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 A301590 Primes p such that there are no other solution to A023900(x) = A023900(p) than a power of p. 2
 2, 3, 5, 7, 11, 17, 19, 23, 29, 31, 43, 47, 53, 59, 67, 71, 79, 83, 101, 103, 107, 127, 131, 137, 139, 149, 151, 163, 167, 173, 179, 191, 197, 199, 211, 223, 227, 229, 239, 251, 257, 263, 269, 271, 283, 293, 307, 311, 317, 331, 347, 359, 367, 373, 379, 383, 389 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE 2 is a term because there are no other solution to A023900(x) = A023900(2) than other powers of 2. PROG (PARI) f(n) = sumdivmult(n, d, d*moebius(d)); isok(p, vp) = {for (k=p+1, p^2-1, if (f(k) == vp, return (0)); ); return (1); } lista(nn) = {forprime(p=2, nn, vp = f(p); if (isok(p, vp), print1(p, ", ")); ); } CROSSREFS Cf. A023900, A301374. Complement of A301591. Sequence in context: A042988 A167135 A129990 * A293194 A162566 A040085 Adjacent sequences:  A301587 A301588 A301589 * A301591 A301592 A301593 KEYWORD nonn AUTHOR Michel Marcus, Mar 24 2018 STATUS approved

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Last modified June 1 00:27 EDT 2020. Contains 334756 sequences. (Running on oeis4.)