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A089122
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Triangle read by rows in which row n gives prime factors of n^2 + 1.
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0
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2, 5, 2, 5, 17, 2, 13, 37, 2, 5, 5, 13, 2, 41, 101, 2, 61, 5, 29, 2, 5, 17, 197, 2, 113, 257, 2, 5, 29, 5, 13, 2, 181, 401, 2, 13, 17, 5, 97, 2, 5, 53, 577, 2, 313, 677, 2, 5, 73, 5, 157, 2, 421, 17, 53, 2, 13, 37, 5, 41, 2, 5, 109, 13, 89, 2, 613, 1297, 2, 5, 137, 5, 17, 2, 761
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| H. Rademacher, Lectures on Elementary Number Theory, pp. 33-38.
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PROG
| (PARI) allasqp1(m) = { for(a=1, m, y=a^2 + 1; f = factor(y); v = component(f, 1); ln = length(v); for(i=1, ln, print1(v[i]", ")) ) }
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CROSSREFS
| Cf. A002496.
Sequence in context: A016589 A151572 A166376 * A198604 A198253 A159989
Adjacent sequences: A089119 A089120 A089121 * A089123 A089124 A089125
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KEYWORD
| easy,nonn,tabf
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Dec 05 2003
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