a(1) = a(2) = a(3) = 1; for n>2, a(n+1) = a(n) + a(n-1) + a(n-2) iff a(n) is prime, otherwise a(n+1) = a(n) + 1.

A113058

a(1) = a(2) = a(3) = 1; for n>2, a(n+1) = a(n) + a(n-1) + a(n-2) iff a(n) is prime, otherwise a(n+1) = a(n) + 1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =5a(6) =11a(7) =20a(8) =21a(9) =22a(10) =23a(11) =66a(12) =67a(13) =156a(14) =157a(15) =380a(16) =381a(17) =382a(18) =383a(19) =1146a(20) =1147a(21) =1148a(22) =1149a(23) =1150a(24) =1151a(25) =3450a(26) =3451a(27) =3452a(28) =3453a(29) =3454

External references