A129748 Numbers n such that the sum of the first n primes with the final digit 9 is prime.

1, 3, 7, 11, 13, 19, 37, 39, 61, 73, 89, 107, 109, 113, 117, 147, 153, 159, 171, 173, 207, 241, 253, 307, 311, 329, 347, 419, 429, 461, 481, 491, 497, 509, 523, 529, 539, 543, 559, 613, 617, 631, 651, 691, 701, 703, 731, 737, 741, 753, 799, 809, 813, 823, 827

Offset

1,2

Links

Table of n, a(n) for n=1..55.

Formula

a(n)=primes in A030433 added to obtain A129081(n)

Mathematica

Position[Accumulate[Select[Prime[Range[5000]], Last[ IntegerDigits[#]] == 9&]], _?PrimeQ]//Flatten (* Harvey P. Dale, Aug 23 2017 *)

Crossrefs

Cf. A129081; A000040; A030433.

Sequence in context: A341864 A067542 A346156 * A310198 A310199 A176800

Adjacent sequences: A129745 A129746 A129747 * A129749 A129750 A129751

Keyword

easy,base,less,nonn

Author

Tomas Xordan, May 14 2007

Status

approved