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A275114
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Primes p for which the sum of the numbers in the Collatz iteration (A033493) of p is a prime.
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0
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2, 67, 149, 163, 229, 359, 373, 401, 571, 719, 727, 827, 919, 941, 1031, 1049, 1129, 1153, 1201, 1283, 1307, 1319, 1433, 1453, 1627, 1637, 1987, 2017, 2089, 2137, 2237, 2267, 2281, 2351, 2543, 2617, 2731, 2819, 2851, 2861, 2927, 2969, 3191, 3253, 3581, 3671, 3719
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OFFSET
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1,1
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COMMENTS
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Primes p such that A033493(p) is a prime.
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LINKS
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EXAMPLE
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Prime 67 with Collatz trajectory (67, 202, 101, 304, 152, 76, 38, 19, 58, 29, 88, 44, 22, 11, 34, 17, 52, 26, 13, 40, 20, 10, 5, 16, 8, 4, 2, 1) is a term because A033493(67) = 1459 (prime).
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MATHEMATICA
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PROG
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(Magma) [n: n in [1..4000] | IsPrime(&+[k eq 1 select n else IsOdd(Self(k-1)) and not IsOne(Self(k-1)) select 3*Self(k-1)+1 else Self(k-1) div 2: k in [1..5*n]]) and IsPrime(n)]
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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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