OFFSET
2,1
COMMENTS
A variety of conjecturally infinite subsequences and starting with {2, 5, ...} can be shown in the graph of the sequence. If the number of primes of the form n^2 + 1 is finite, then the last subsubsequence of the graph abruptly becomes A002144(n) union {2} (odd Pythagorean primes with the number 2). In this case, the discontinued forms of the graph disappear. But this case is highly improbable.
LINKS
Michel Lagneau, Rows n = 2..557 of irregular triangle, flattened
EXAMPLE
MAPLE
with(numtheory) :lst:={}: for n from 2 to 150 do:p:=n^2+1:x:=factorset(p):lst:=lst union x:if type(p, prime)=true then print(lst minus {p}):lst:={}:else fi:od:
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Michel Lagneau, Feb 01 2013
STATUS
approved