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A340077
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Odd numbers k for which k-1 is a multiple of A053575(k) [the odd part of phi(k)].
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4
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1, 3, 5, 7, 11, 13, 15, 17, 19, 23, 29, 31, 37, 41, 43, 47, 51, 53, 59, 61, 67, 71, 73, 79, 83, 85, 89, 91, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 255, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313
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OFFSET
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1,2
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COMMENTS
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Sequence A003961(A340076(i)), i = 1.., sorted into ascending order. In other words, this sequence consists of such odd numbers k that A064989(k) is in A340076.
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LINKS
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PROG
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(PARI)
isA340077(n) = ((n%2)&&!((n-1)%A000265(eulerphi(n))));
(PARI)
A064989(n) = { my(f=factor(n)); if((n>1 && f[1, 1]==2), f[1, 2] = 0); for (i=1, #f~, f[i, 1] = precprime(f[i, 1]-1)); factorback(f) };
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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