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A244846
Least triangular number t>p such that q=p+t is also prime, where p=prime(n).
0
3, 10, 6, 10, 36, 28, 36, 28, 36, 78, 36, 66, 66, 66, 66, 78, 78, 66, 190, 78, 78, 120, 210, 300, 136, 210, 120, 120, 120, 120, 136, 300, 210, 210, 210, 406, 190, 190, 276, 210, 210, 276, 210, 378, 630, 210, 276, 276, 276, 378, 276, 378, 300, 630, 300, 300, 300, 276, 300, 378, 378, 300, 630, 528, 378, 630, 378, 406, 630, 378, 528, 528, 406, 378, 528, 528, 630
OFFSET
1,1
COMMENTS
Corresponding values of primes q: 5,13,11,17,47,41,53,47,59,107,67,103,107,...
Among first 10000 terms, maximal value of q = 238859 is at n=9924.
Indices, i, of triangulars t: 2,4,3,4,8,7,8,7,8,12,8,11,11,11,11,12,12.,...
Among first 10000 terms, maximal value of i = 519 are for n = 8782, 9074, 9719, 9912, 9924.
EXAMPLE
q=2+3=5, q=3+10=13, q=5+6=11 all prime.
CROSSREFS
Sequence in context: A088337 A195919 A275741 * A210415 A337275 A087397
KEYWORD
nonn
AUTHOR
Zak Seidov, Nov 12 2014
STATUS
approved