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A229967
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Numbers n such that A229964(n) = 4.
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4
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18, 26, 28, 39, 65, 115, 119, 133, 319, 341, 377, 403, 481, 517, 629, 697, 731, 779, 799, 817, 893, 1007, 1207, 1219, 1357, 1403, 1541, 1769, 1943, 2059, 2077, 2117, 2201, 2263, 2291, 2407, 2449, 2573, 2759, 2923, 3071, 3293, 3589, 3649, 3737, 3811, 3827, 3959
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OFFSET
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1,1
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COMMENTS
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Equals {18, 26, 28, 39} UNION {pq | p, q prime, p >= 5 and (2p+3 <= q <= 3p-2 or (p == 2 (mod 3) and q = 4p+3))}.
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LINKS
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PROG
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(Sage) sum(([p * q for q in prime_range(2*p+3, 3*p-1)] for p in prime_range(5, 10000)), []) + [p * (4*p + 3) for p in prime_range(5, 10000) if (4*p+3).is_prime() and p%3==2] + [18, 26, 28, 39]
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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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