login
A287748
If A070281(n) is not 0, then a(n) is index of the starting primes for form A070281(n), or a(n) = 0 if A070281(n) = 0.
0
1, 2, 3, 2, 3, 2, 7, 0, 2, 0, 3, 2, 10, 2, 2, 0, 2, 0, 5, 0, 4, 0, 4, 0, 3, 0, 4, 0, 6, 0, 6, 0, 4, 0, 3, 0, 3, 0, 6, 0, 4, 0, 4, 0, 4, 0, 4, 0, 5, 0, 7, 0, 2, 0, 2, 0, 25, 0, 10, 2, 2, 0, 6, 2, 2, 0, 8, 0, 8, 0, 2, 0, 3, 0, 2, 0, 9, 0, 4, 0, 5, 0, 16, 0, 11
OFFSET
1,2
EXAMPLE
A070281(13) = 691 = prime(10) + ... + prime(22), thus a(13) = 10.
CROSSREFS
Sequence in context: A255354 A344349 A318620 * A260233 A108656 A164962
KEYWORD
nonn
AUTHOR
XU Pingya, May 31 2017
STATUS
approved