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A225389 Prime powers (A025475) representable as (p+q)/2, where p and q are distinct prime powers, in two or more ways. 1
781370209, 59015782001929, 109012413691801, 185341023228001, 275502533796361, 315952509152809, 613721000732449, 1579642847367841, 3182047597748881, 5927491050020401, 13602074755852489, 22706626517726761 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Prime powers p such that there are x and y such that p+x, p-x, p+y, p-y are four distinct prime powers.
First 12 terms are squares of prime numbers.
Conjecture: the sequence is infinite.
LINKS
CROSSREFS
Sequence in context: A297867 A344729 A344730 * A166121 A348079 A046186
KEYWORD
nonn,hard,more
AUTHOR
Alex Ratushnyak, May 05 2013
STATUS
approved

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Last modified July 25 05:51 EDT 2024. Contains 374586 sequences. (Running on oeis4.)