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A152868
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Beginnings of maximal chains of primes with five members (four links).
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8
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61, 1069, 2293, 2879, 5441, 20347, 145823, 183949, 187171, 207629, 219649, 278087, 412171, 420467, 421273, 507503, 536479, 696937, 698311, 774929, 792283, 1028081, 1310137, 1432927, 1470757, 1726211, 1803881, 1861817, 1904477, 1928561
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OFFSET
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1,1
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COMMENTS
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For definitions see A152658, of which this is a subsequence.
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LINKS
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EXAMPLE
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First maximal chain of primes with five members (four links) is 61, 67, 71, 73, 79; the linking primes are 2371, 2693, 2953, 3271.
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PROG
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(PARI) {n=1; while(n<144100, c=0; a=prime(n); while(isprime(n*prime(n)+(n+1)*prime(n+1)), c++; n++); if(c==4, print1(a, ", ")); 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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