A045807 7-ish numbers (end in 53, 71, 79, 97).

53, 71, 79, 97, 153, 171, 179, 197, 253, 271, 279, 297, 353, 371, 379, 397, 453, 471, 479, 497, 553, 571, 579, 597, 653, 671, 679, 697, 753, 771, 779, 797, 853, 871, 879, 897, 953, 971, 979, 997, 1053, 1071, 1079, 1097, 1153, 1171, 1179, 1197, 1253, 1271

Offset

1,1

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Formula

Empirical G.f.: x*(53+18*x+8*x^2+18*x^3+3*x^4)/(1-x-x^4+x^5). [Colin Barker, Jan 23 2012]

Prog

(Haskell)
import Data.List (findIndices)
a045807 n = a045807_list !! (n-1)
a045807_list = findIndices (`elem` [53, 71, 79, 97]) $ cycle [0..99]
-- Reinhard Zumkeller, Jan 23 2012

Crossrefs

Cf. A045800-A045809.

Cf. A045572, A045797, A045798.

Sequence in context: A223091 A301479 A244187 * A007644 A136073 A133187

Adjacent sequences: A045804 A045805 A045806 * A045808 A045809 A045810

Keyword

nonn,base,easy

Author

J. H. Conway.

Extensions

More terms from Erich Friedman.

Status

approved